Those should be addressed by app store mechanisms for charging for upgrades. Then those who want them can pay and those who don't can ignore them.

I seldom accept any upgrades and keep old versions of apps backed-up in case I rashly do click 'yes'. I know I'm not unique; if an app works, why tempt fate by upgrading it?

Unfortunately with this subscription model everyone will have to pay regardless of whether they want those new features.