Perhaps, but you can get away with bigger sleeves in Judo because some of the grips used in BJJ are actually illegal in Judo. Like where you twist up the sleeve and pistol-grip it. Definitely would get you a shido in a Judo match.
Those grips are banned mainly because they can be used for extreme defense, but are not so good for attacking because they are at the end.
I think sleeves make a huge difference in BJJ, especially against someone with a good spider guard, because you HAVE to break the grip first before you can start to pass.
Not really, in my personal experience the first thing i trained BJJ and met the spider guard, i had a lot of trouble thinking "What kind of BS is this?" i feel it too stalling, however im also of the mentality of "Wherever you go" and i always play with the rules trying to learn something new.
After a while i found out that the reason i couldn't bump the leg was because of the control of the movement of the hand, and that its relatively easy to grab my own wrist with one of the hand, that takes away control of the movement of the arm and allows you to bump the leg upward and towards the other leg, if he doesn't loses the grip he only works at my favor as i can do the same with the other arm and i have both arms under his legs and i can go for a belt lift pass. He either has to lose the grips or try a triangle when i get the first arm free, either way the spider guard is gone, and if you are aware of the triangle its easy to block.
And the wizard sleeves actually make ezekiel chokes looser in my experience. If you have narrow BJJ sleeves, it's only going to make the choke that much tighter.
You can always pistol grip your own gi and get the ezekiel easier.
The only good thing about a loose gi, IMO, is that it makes you harder to throw because you have more room to move around inside the gi. What is an advantage in standup quickly turns into a disadvantage when you hit the ground though.
Loose gi is a big disadvantage in stand-up too, even if you have more room to move inside you can still be moved around while helpless and its harder to break a grip when your gi is loose. You are right when you say that its harder to throw someone loose, but the problem is that when someone throws you he won't be grabbing you by the tips, he is going to grab behind the arm where the gi is not loose.