Not sure where all the hate is coming from. Schools level faster when changed to primary skill. Miner/Gatherer level rate is unaffected.
Not sure what made you think this was a dragon vs biped thing. It's not.
Your construction schools would level faster if they changed it.
The only thing that brough up the exp equalizations was comparisons of one biped structure vs another biped structure. There are some wildly varying exp amounts given depending on the structure.
Again, not what this is or ever was about.
The very first school given the Primal skill treatment was a biped school, Confectioner. Then Lairshaper, Scholar (pretty sure during the revamp), and finally Crystalshaper.
You get about triple or quad the exp to apply items with this method, it more than makes up for the missing exp from the smelting, stoneworking, etc. I know I went from 85 to 100 DLSH just finishing a T5 Hall. 1 Building. At least I was actually building something.
All that said, The existing layout has been in place for 12 years. Don't see why the biped schools need to be made easier at this point. Just fix the Human Clock Towers' crazy exp (probably needs lowered by 75% to make it match the rest of the structures) and be done with it. Dev time would likely be better spent on new quests/lore/epic spells, etc.