I think the Unit Caps where a step in the right direction but with certain factions like the Vampire Counts and the Lizardmen the Rare Single Entity restriction seems a bit much...
For Vampire Counts they really don't have to many ways of building their roster.... Partially because they continue to have several units on their roster that are Under Powered or Niche and partially because of their Army Design by Games Workshop. Flyers are also super limited when you consider bats are super cheap.
Lizardmen on the other hand should be able to take advantage of their Feral Bastiladon and other low cost Singe Entity monsters.... While there was never a competitive build that spammed Skinks and Monsters it should be something the Lizardmen are capable of.
Perhaps if instead of a Hard # of units cap on the various categories it was instead a $ Gold limit.
I guess the crux of my thoughts.... are that RSE & Flying slots are in part extra limited because in most factions RSE & Flying are rather "Elite" units.... but not every faction's units are and these restrictions are limiting for them.
Give us Doombull, Great Bray-Shaman, Wargor, and Tuskgor Chariot.