removing AA would mean you can never really merge with live and it also would remove a ton of content. Letting you get AA lower level solves that, 10 weeks to get to 55 is alot more tolerable if you have AA to get. Then 8 more weeks at 60.
Without even more tweaks than we are talking about most raids will be straight up impossible anyway. Rathe council for example requires a lvl 64 mez. If you have ever leveled chardok from 50-60 you understand tanks mitigation purely from levels is night and day. It is entirely possible that even with AA restrictions removed that a ton of content is just straight up impossible in the era it unlocks.
Remember, too, that a lot of mitigation / avoidance is gone without having higher defense, offense, weaponskill, etc skillcaps. Defensive/Furious discipline, for instance, simply won't exist prior to 55/60 cap, so you'll be doing a lot of this content with knights tanking due to shields giving overcap AC (which is in short supply at 40, and considerably lower than 60 AC softcap)
All of those factors make the content impossible without mitigation/avoidance/ND AAs at bare minimum, and like others have said here, I don't think GoD will be doable, and later PoP zones will likely be impossible as well. Rathe Council cannot be mezzed with 40 spells so it'll have to be kited with 40 Selo's, you're too low level for Song of Travel, Selo's Accelerating Chorus, bard resists songs will give lower values, no circle resists, no KEI or even C2, shamans need to individually buff as you'll be too low for IOS, etc - it'll be fun to see how folks devise solutions to problematic bosses.
We also don't know if MOTM will be on this server for /all/ content or not. I imagine so, which will basically result in a lot of mobs with AOEs one shotting.