So more snare is not really useful.
But concerning the whole Grenadier tree more damage as some have suggested is the wrong direction.
Grenadier is a fluff damage dealer and the tactics in Grenadier tree boost the tree itself but not the damage output.
We have there more Range tactic, more radius of Acid and frag bomb, reduced ap costs.
More range is one of the mandatories so extra powder, the acid radius increase, is hardly taken.
Increasing the dot damage was incorporated into the bombard turret.
So if Grenadier is the fluff damage to the warband king then take it to the top and activate extra powder all times.
The tactic is broken since last November. And will most likely be repaired soon.
Thing is the normal 20 feet on acid and Frag are REAL small.

On the image you see three dark elfes.
If you hit that one on the left with a normal Acid bomb only the one in the Centre get it.
So if you are in a keep funnel you will hardly hit 9 people in that 20 feet radius. There aren't 9 tanks pushing in this small area.
So my idea to put the Grenadier to the fluff king would be to activate the Extra Powder tactic if you are using the Grenadier tree, or general on Tinkerer.