Since the MTT/Series schedule has everything to do with me...
I'll echo Stubbes responses to everything and add some more context.
The slower the tournament, the worse it is for bad players, because they're going to get chewed up postflop by good players. What players want, and what it good for them are two different things a lot of the time. One of the worst performing tournaments we ran during the micro series last year was the slowest tournament and at the lowest buy-in. Saying that, the schedule isn't specifically designed to make all low stakes tournaments fast, but has everything to do with them finishing at a reasonable time if they're one day tournaments. It also has nothing to do with encouraging rebuys, if we wanted that, we'd extend the late reg past 20bb starting stack (which is a lot earlier than competitors) and/or we'd just uncap the rebuy amount. We don't do either of these, at the expense of making money, to improve player experience.
We've been tailoring the blind level to adjust for field size for multiple series now, this isn't new and you're the first person to complain about the change. It's also not unique to Unibet, look at major series on other sites and you'll see the same thing.
You pay 5% rake on any PKO, at any buy-in, in any tournament, series or regular, for blind levels from 5min+ and it's been this way since Oct 2022. It's the lowest rake for PKOs in the regulated industry by a good margin. The majority of sites charge more rake at lower stakes than at higher in MTTs... $11 (10+1) vs $109 (100+9) for example, where as we do not.