Hum... I didn't followed all the post here. I hope I'm not repeating someone.
What I understood it's the following :
Learning slot and knowledge acquiring are based on INT (so not equal for each character by definition), so you could have 40, 60 or 35 slot not really matters (or at a very high level of play... and it's to be demonstrated yet).
Let's assume we have 7 casting slots on hotbar to use :
Questions : if you have 35 slot memory how many skill permutation you could have ? 6 724 520 !
if you have 60 memory slot at disposal : 386 206 920 permutation !
So please ^^ If the VIP didn't give a casting slot it's not an advantage, it's a drop of water on the ocean.
Remember spotlight #3
if you’re afraid Talents create a power wide gap between new and experienced players, you can stop worrying already! Talents are certainly an important complement to a character build, and we’re sure different setups will be widely debated in the competitive crowd. However, they’re just that: complements. The main strengths and weaknesses of your character are established when you create it!
Ps : it could be possible to have useless gameplay permutation but it's still high and it's not 1 or 2 memory slot who change anything.