I havnt played since patch 2 aha
imo Stealth is *supposed* to be cheesy and busted, you're literally trying to be as unfair as possible by sneak attacking and ambushing, but its also a much slower and more involved way of playing requiring lots of stealthing, using armour that doesnt give disadvantage on stealth, not using light sources etc
if you set up an ambush you should be rewarded for taking the time and effort to do so instead of just running in and slinging magic missile at everything in sight
I think it would be nice if as a party you could enter stealth as a group, or have an "Ambush" button you use to go into a group stealth where you can select actions but nothing happens until you click Ambush again and then have all the actions be resolved at the same time, similar to how breeching works in XCOM, and how Holding your Action would work on table top
trying to recreate those time on tabletop where your party sets up an ambush and all holds their actions to strike at once and get the drop on a baddie or baddie patrol is definitely something that should be possible and effective