Sure, but bespoke software isn't necessarily going to be more reliable.
https://www.joelonsoftware.com/2000/04/06/things-you-should-...
> The idea that new code is better than old is patently absurd. Old code has been used. It has been tested. Lots of bugs have been found, and they’ve been fixed.
Alpine and Mutt are about 20 and 30 years old, respectively.
This quote is completely and totally irrelevant. Nobody is saying they should code a new Outlook. If they did code something, it would be significantly smaller in scope and rigorously tested like spacebound programs in the past were. "New space-engineering-grade code created with actual engineering practices" is absolutely going to be more reliable than "old bloated commercial shitware". But I guess software engineering is a lost art, so it can't be helped.