Max is absolutely a better player this year than he was last. I don't know how anyone can watch him play and not think he's a better player than what we saw in 2019. We can debate all day HOW MUCH better he is and how much of the improvement should be credited to Sonny or Max himself. But he's a better player.
I actually think the bigger indictment of Cumbie and everyone involved in recruiting and developing QB's is the fact that Max clearly wasn't ready to go from Iowa HS football to the Big 12 last year as a true freshman (which is no knock on him) and yet was still far and away the best QB option on the roster. Some of that can be attributed to injuries to Rogers and Baldwin but it mostly speaks to a long line of recruiting and development failures before 2019.
Realistically, 2019 should've been a redshirt year for Max. He got shoved onto the field before he was ready and that's what led to a lot of what we saw last year. If what we were getting this year from Max was the first we'd ever seen of him then I think everyone would be excited as hell about his future. And I'm sure many people are excited about his future anyway. They certainly should be imo.
went back and looked at when sonny was hired, which quarterbacks he actually sought out, and then the rosters in 2015-19 and i think it goes a long way to addressing your second paragraph
sonny was hired at tcu on dec 2013 and foster and grayson both were committed for several months prior to his hire. the frogs . he inherited from the 2013 roster boykin, zach allen, and tyler matthews.
matthews transferred out and the frogs in the 2014 offseason added foster, grayson and bram.
here are the next four years of quarterback signings
2015 -no quarterback signed
2016- brennen wooten
2017- shawn robinson
2018 - justin rogers
the frogs did add kenny hill as a transfer in 2015, but when you go back and look at that 4 year string it really does reinforce your second paragraph missing on recruits is going to happen, but what happened in 2015 and 2016 really set back their depth at the position and that was made significantly worse with shawn's implosion and then rogers.