If I read the original poster's objection right, the issue they're talking about isn't Crystal Tower specifically, but rather Crystal Tower to the exclusion of other duties. Right now, the ilevel cheesing and whatnot means people rarely get the later raids even when they'd be eligible, and those raids need people. Arguably, the fact that many people are only eligible for the Crystal Tower raids means the people who are eligible for the later ones are even more needed to fill the later content, because there are fewer of them available overall.

When folks try to queue up deliberately for the Ivalice raids—whether because they like them, or because they need to do them for the Resistance/Bozja storyline—and end up having to wait in queue for an hour or more... well, that's the exact situation roulettes are meant to address. And the fact that they're not addressing it right now does mean you could argue that some changes might be beneficial.

Sure, even if you fixed it, people would most often get Crystal Tower, because—as was noted—many people do alliance raid for XP while leveling, or players only unlock Crystal Tower (since it's now story-mandatory) and never unlock the others. But where it would change things is that the people who were queuing for the other alliance raids wouldn't have queues of an hour or more.

And I think that's the part they meant when they talked about people cheesing the roulette for 'efficiency' being detrimental to other players.

Sure, it's easy to say "just queue for the other raids if you like them", but it's hard to do actually do that if the queue never pops.