When you jump from OD&D to 1e to 2e to 3/3.5e to 4e the rules change and everyone gets grumpy either because the rules change or because they are fed up of people getting grumpy because the rules change.
They are entirely different games but with the same name. It’s like someone getting annoyed because they play Rolemaster and White Wolf bring out a new version of Vampire. Okay that’s quite an extreme example but the sentiment is the same.
They are different games and the old ones have loads of material out there for them. If you don’t want to play the new rules then just shut up and play the old ones. Ascending/Descending AC works for the systems they are used in and Thac0 had it’s place. DEAL WITH IT!