You are "lucky" that your code was not affected/impacted from the changes throughout the decade. I have written my first app in the winter of 2017, and because of the functionality/libraries/code I used, every update has been a pain in the butt. Not impossible, but I did it as a hobby, not as a profession/income.

I understand the need to progress and develop/create/evolve the programming languages, techniques, environments, it's just not fit for a hobby (in my case)(YMMV).