Predictable, usually. Lag free? Not in my experience. Most of the time there’s a good quarter to half second between requesting the shift and the transmission acting.
For me at least, that lag is very effective at disconnecting me from the experience of driving.
Oh, I don't dispute that maybe very modern cars have addressed this. I don't swap cars too often and have been pretty happy with my "one transmission, a planetary reduction gearbox" car (maybe there are 2 transmissions, one on the front motor and another on the rear motor? Regardless, there's a static gear ratio that's always engaged).
The lag is only part of the issue -- it's the determinism of the lag -- the 125ms lag between "more power please" and getting more power is actually more lag than the instant ka-chugachug of asking for more power and getting feedback of "you're in the wrong gear, bubba" if you're in a manual transmission car.
As far as "I won't change gears for you unless you ask" transmissions -- I've never driven such a car, I'm sure they're quite nice. I somewhat dislike the gear changers with no affordance to indicate what gear you're in (this applies to wingding manumatic cars, motorcycles, and modern bicycles with thumb / finger triggers) -- I don't use them often enough to have the muscle memory of "up for lower gear ratio" or whatever, I have to think about it and look at an indicator and fiddle with it to get the right ratio for what I want.
I'm sure with practice it would eventually be fine; but in actuality I've found that the electric car is actually exactly what I want.
For me at least, that lag is very effective at disconnecting me from the experience of driving.