Well, as a former Thief I can say that it's pretty bad. I mean even if u for some reason pick SA, many classes can reveal u, like warrior's shout and even if with your mobility u're almost unkillable, what's the point if u Can get killed by one combo or perma fear and just running around isn't much helpful. + In many games I'd encounter not brain-dead opponents who would camp their point so I couldn't even decap and winning 1v1 either took really long or I was obliterated by cc / 2 hits. Since I'm in a trash League I could win most of the 1v1s easily tho, but competent opponents were hard to deal with or I'd just insta die. Stealth isn't Op, it's just annoying and pistol 5 could be useful in teamfights but wait, blind can be insta condi cleaned and even if they wouldn't for some reason, it's not like u can deal solid dmg so 5(blinded)v4 isn't that much of a deal. Anyways tip for thief players: Switching class was pretty relaxing cause all other classes (tried all, currently ele+war player) are in a better state rn. So don't waste your time, enjoy the game.