Not really, you certainly don't need to be i90 to clear turn 5--and if anything, as my last couple t5 clears have shown, having full group i90 actually means the party has to re-learn parts of the fight because we have so much DPS lol. Have you tried/cleared it? It's a fight that requires everyone to pay close attention to everything, even things you maybe don't normally need to pay attention to, like as a DPS I'm also watching HP bars and the entire party's positioning, not just my own in relation to the boss. Sure, you need good gear, but that's a mechanics-heavy fight with phases and transitions where certain things need to happen or you wipe. The only way to make turn 5 more accessible would be to actually ease up on some of its mechanics like Torquill mentioned, like they did with twisters already.
PS: My first T5 clear, the week before 2.1, was actually with a pickup group, only one of whom had cleared it before. We all had practiced a lot with various groups/statics and all it took was getting together a group that didn't have anyone in it that was bad at the fight's mechanics and we won.
