Our halfcourt offense is...not great. Also Steve Kerr has to have one of the all time dumb looking faces.
I won't argue that Tyrese is the weakest defender on the roster, or maybe comparable to Steph...but it wasn't luck that he led the #1 offense in the NBA to the ECF ahead of schedule for their roster.
If they lose because of stagnant offense it was a choice to sit their best playmaker. LeBron has been a good playmaker for them up to this point masking it, but it's the one thing the roster isn't loaded with. Then in Joker you're facing an all time great offensive playmaker.
With Tyrese these shooters all get easier looks and the bigs get easy dunks, it wouldn't make sense now having relegated him to last on bench, but if he'd have worked him in the entire way it's a weapon Kerr could have had.