Nope.
While I personally love tank drive, arcade can easily be just as intuitive, it’s all dependent on how the driver is, there is no one size fits all.
Definitely not.
While having more buttons and therefore more functions is great, it also requires the ability to multitask, so it’s worth honing your reflexes and whatnot to be able to properly utilize all the extra buttons either scuffs or a different controller grip would provide.
(Hey, while you’re here, check this thread out)
One thing you’ll find very quickly is that 99 out of 100 times, your route in a tournament is going to go very wrong, very quickly. One of the best things a driver can be able to do is react and adapt to whatever is happening on the field. Maybe practice some skills while still grasping a feel for your robot, but reach out to other teams in order to do some scrimmages, hone those reactionary skills, not only will they help in VEX, you can take them with you wherever you go.