I just created an account to respond to this.
Because Sneaking is bugged, and guerrilla + sneaking could actually be worth using if sneaking was working correctly.
Sneaking doesn t work in combat at the moment. You can sneak behind someone and teleport to an opposite direction out of line of sight and move even further while sneaking, they will still know where you are and run to you.
Even with the current sneaking cost, it would still be ok if you were playing glass cannon rogue. But you simply cant use it in combat it has no effect whatsoever.
The only use for sneak to work in combat is when you are invisible. At the end of the invisibility if you are in sneak they wont know where you are. That is the only way it actually works.
This can be used to cheese mobs, kill a mob use invi and sneak somewhere, wait for CD and repeat. But this is the worst gameplay ever and has no use in a multi character setup ( since you have to skip a lot of turn meaning your whole party will be dead before you have any impact ).
Sneaking should make you invisible like invisibility when you are out of vision cone. That s how it should work against normal enemies.
So please fix Sneaking, so we can actually test it with glass canon in combat to make it for the high AP cost ( glass canon give you a free sneaking every 2 turn kind of ).
The gameplay would probably be really challenging, and you would have to use combat turn/ delay and initiative to optimize your damage if you have to remain in invi or sneak at the end of your turn ( since a glass cannon doesn t last long otherwise ).
Invi from polymorph would still have its use in such gameplay, because it cost only 1 AP and would give you more AP to do damage during a turn.
Here is an example of how we should be able to play glass canon rogue:
Start in sneak mode.
TURN 1
Make one of you other party member delay his first turn and wait for him to play last before you engage with a sneak attack ( because when you use sneak attack out of combat you will be last to play so you need to use it at the latest moment possible during the first turn ).
After your sneak attack play your turn normally using all your 6 AP for damage + 2 AP adrenaline if you want ( 8 AP worth of damage, aka 2 turn for a normal character ).
TURN 2
Make sure you have enough initiative ( gear + stat ) so you can play first this turn.
You have 4 AP since you used adrenaline and you are glass cannon so you can go in a good position with pawn and use sneak. ( 0 AP worth of damage )
TURN 3
Delay you turn so you can play last.
Use all of your 6 AP to do damage.
TURN 4
You should have enough initiative so you can play first this turn.
Use 2 AP for damage and 4 to sneak away.
...
etc.
So the gameplay basically make you use AP for damage every 2 turn but since you use glass canon, you will do the same amount of damage than any other character ( 8 AP of damage every 2 turn ). So 4 AP cost sneak seems balance to me. And guerrilla would actually be useful to make the 4 AP sneak more worth it.
This should be possible to do ( but you cant since sneaking is bugged obviously ), and would actually make you play a stealth character without being OP. And it would even be fun and challenging since you probably wont be able to pull the sneak at the end of every turn all the time ( you may have to use teleport or adrenaline to get enough AP to do it, or even the invisibility spell... or just get cc forever and die ).
I really hope you will fix the sneak bug so we can actually play rogue like that, like it should be played :p
