On my leveling experience until I reached 280 on Cry2 Kino 3 War -
Essentially I would say that surespell does eliminate a lot of annoyances surrounding psychokino but it is definetly not 100% required, you would be trading some of your ability to throw out spells as quickly as possible for whatever utility that one circle (or two if you want quick cast) can provide. Surespell provides a much smoother playing style and the edition of quick cast allows for much higher damage.
Up to the point where you get raise and gravity pole it can be pretty irritating, but these two spells make it very feasible to control every enemy, even cc resistant Nuos in storage and cc resistant Crossbow ticens in Maven. It mostly comes down to not throwing out your spells until you are sure you won’t be interrupted, i.e. letting the mages that target you cast their spell first if you plan to channel gravity pole or PP or using raise first, so that you won’t be interrupted by a spell still in midflight during channeling. Mind you this also means playing smart around bosses to not let your ice wall/PP and gravity pole be interrupted by certain rotation spells like a poatas knockdown in missions or mirtis’ shotgunning lightning bolt (field boss version).
For your interest, I went psycho 3 with cryo 2 mainly for 2v2 pvp, and I would honestly recommend surespell if you wanted to do something like 5v5 or earth tower as the chance of interruption is much much higher. In my situation, having tested both with and without surespell on the kr servers,I deemed it not something I needed to have in the current pvp meta.
I hope this helps you a bit.