What version doesn't need 'code signing'?

I’m a user since prior 1, but right now using 1.0.0.2.1

I want to try out 1.5.0 and I’m hearing all this talk about ‘code signing’ and that you need to reinstall every week since the signings only last 7 days.

What in the world is all this? Is this new? If not, shouldn’t AppSync take care of this?

I’ve had 1.0.0.2.1 sitting on my phone for years and not had any problems whatsoever… and always remains accessible without any maintenance.