5 floors each raid tier in 5.0?

[Jeykama]

They'll never do "proper raids" with Savage difficulty as that would mean having to do fights you've already beaten every time you want to prog.

Of course it couldn't be the same exact system as 24Ms where you always start from the beginning. 24Ms work on a completely different lockout premise.
Programmers are able to set up checkpoints where if you progress in a raid to a certain point, you can re-enter from that point later. Not going to say it's not hard to set up, but WoW large-scale dungeon raids are like that and those actually feel like a huge place. That's the feeling I miss (though not WoW)

[Sove92]

Programmers are able to set up checkpoints where if you progress in a raid to a certain point, you can re-enter from that point later.

This is how Coil and Alexander worked before RF was released. The problem is that it isn't friendly to replays. You could not replay a Coil fight in a given week until 2.45, and for that, you needed a player without a weekly clear of that particular fight. When RF released, they got rid of the checkpoints, making replaying easy, but kept the same progress system for the loot lockout and to make you do the fights in order, which is also the reason you lose all rewards from earlier fights, if you skip them, as the game doesn't check the clear status of individual fights.

The people who do these fights more than once a week for various reasons, would not be particularly happy, if the ability to replay the fights was restricted again. Alternatively SE could allow you to start from any checkpoint you have met, but that would likely need a lot of work on DF and might be a horrible list to choose from.