I am by no means an expert in faction balance but I do like my statistics. Here's my take on point 1 of the OP; Destro > Order.
As other commenters already pointed out, examining balance in content smaller than wb v wb is not the way to go about it, since that is not the main balancing focus. So, looking at massive rvr balance between factions I'm surprised to see so many people here point to W/L ratio for LOTD or other kill data to prove their point. Here's why that is a really bad idea:
1. The results are not statistically signifant due to only having 10 or so days of data since the last balance patch.
2. The results are not statistically significant due to disparities due to population, organization and player skill between warbands from both sides.
3. The results are imbalanced due to
class-related player agency.
The first 2 points can potentially be ignored when enough time has passed and by the influence of Xrealming guilds over time. We are very close to the last balance patch, however, and therefore they should not be ignored.
Let me elaborate on the third point though;
class-related player agency.
By that I refer to the individual choice of us, players, when selecting which class we will play during our sessions. Ideally, I think most of us would agree that this should be a non-issue. But it is. And here is why:
Currently when speaking about a warband in META terms (most effective tactic available), both realms tend to gravitate towards classes that bring something unique and powerful in the mix. There are classes that bring that benefit for the whole WB (e.g. MSH's Pierce Defences or Blackguard's Crimson Death and Hastened Doom) and others that bring that for their party only (e.g. BW/Sorc & DOK/WP dmg procs, Chosen/Kotbs auras). The first category tends to take 1 spot in the META warband, while the others take 4 wb spots (1 in each party). This leaves little to no spots for the ''bad" classes (e.g. Magus, rSH, SW, WE, WH).
So, when a player decides to log in as one of those classes with the aim of playing in an organized warband, they are
choosing to lower the effectiveness of that warband and, by extension, their faction. As I mentioned before, this should not be happening and all classes should ideally be at similar powerlevels in wb play. This can only be resolved by outside class balancing which I will not address now, but since the problem exists, let's examine how it affects Faction balance currently.
1. Destro has fewer "bad" classes/is more equally designed at the moment.
- Tanks: BO finally found a use in being a Move-speed increaser for parties and BG as mentioned above has some great AOEdebuffs
- Healers: Shamans synergise well with Choppas' Chop Fasta who in turn are prominently used as Mdps
- DPS: Sorcs are ideally wanted in all parties but Choppa, Mara, MSH (and in some cases WE) are all used. Magus and rSH are left out usually, but the later can easily respecialize to MSH
2. Order has power concentrated on fewer classes. Won't go in depth, but SM, IB, SW, AM and to a certain extent Engies and WHs do not bring out equal value to the other contenders for the same roles.
Does this mean that Order is weaker than Destro? No. Not really. It's just that players do not utilize the faction's strengths (that come in the form of classes they refuse/don't like to play).
In ideal setups Order are far stronger (imo). Here is a concrete example:
Killing someone is a game of numbers; the overall rate of dmg must be higher than the overall rate of healing towards that target from the moment their health drops from 100% up until it reaches 0%. The bigger the difference between the rates and the smaller their total health is, the faster/easier they will die.
- Let's assume that a party contains a KOTBS with Focused Mending tactic and a Warrior Priest using the ability Sigmar's Grace.
That party will have 15% increased incoming heals and ~10% extra health pools.
- This means that an opposing Destro group will have to either somehow increase their dmg to their target by 15% of enemy heals or alocate more dps on that target to get the same rate of damage done.
- Since the WP wounds buff in in play, they will have to maintain the same rate of damage done for ~10% more time on the target.
On Destro side, the most comparable thing you can have is Chosen's 25% incoming heal debuff aura (KOTBS also has access to a 25% outgoing HD aura) and Blackguard's Hastened Doom tactic (which requires the ability to A. connect through block/parry and B. crit. Both chances can be lowered by Order by them investing in defensive stats).
To return to the topic; Order classes have the tools to fight equally (or even dominate combat, in my opinion). Due to class-related player agency they choose not to utilize them.
"Is it the fault of the players?"
No. Play whatever you like. Just expect results proportionate to the class you use.
Your faction is not underpowered. Your class is just not synergistic enough for wb play.
Balance patches should eventually equalize classes so that you are not punished for not playing KOTBS/RP/WP/Slayer.