Like @swarmofseals has said (quite rightly) tomb kings had been disadvantaged for quite some time before AoS. The rules were always the problem with tomb kings, the models were the only thing keeping the army from being squatted.
Now that tomb kings have the rules that they always should have, of course people are calling for the models to be updated and "unsquatted". Just like Brettonia, tomb kings suffered for years because they were never updated properly, suffering from "codex creep" and neglect from GW.
Have a look at some of the TK models, they are dynamic and unique especially considering their age.