Tony Vargas
Legend
Actually, in the standard game, they are. Because there's no MCing, so without exception, every character gets an ASI every 4th level, period. That's part of how 5e scales. Same is true of HD. Technically, each HD is a function of class level, but you'll always have 1 HD per level. The optional MCing system potentially distorts ASI scaling, but not HD scaling.Again, though, it helps to make sure we are on the same page.
A person is entitled to their opinion. But ASIs are not part of the way 5e scales. That's the RAW.
I honestly don't care if a problematic design is deliberate or accidental, of if the 'fault' lies with the class design or the MC system.But there is every indication that this is a deliberate choice and not some accident that by the designers
I can understand not trying to 'fix' it with errata though, as (a) errata is virtually moot under 5e's rulings-not-rules philosophy, and (b) there's no simple fix. The OP's DM came up with the obvious/simple way to address it, but it introduces dead levels.
OK, there is actually a simple fix: don't opt into MCing.