You are right no one cares how it is implemented, and on select contexts, right that LLMs can produce sufficient implementation.
However it isn't generally the case that they can produce quality software. The bad news for a lot of developers is that by volume most software isn't exactly great quality either, particularly in house enterprise software is already crap, so there is large area where differently crapi isn't so bad.
I will say that people who want their software well supported are likely to be ill served by "vibed" solutions. It is really tricky to debug complex software that was vibed, whether human or GenAI. If it worked perfectly the first time around and/or the software in question is fairly disposable, well those may be fine.
Microsoft already changed what they are selling. Now they are renting document storage that happens to have document modification software integrated.
They long decided that owning access to the data was more leverage than the software used to edit it. Ditto for Adobe. Pretty much immediately software as a service encouraged "don't worry about ever saving/managing your data" and it wasn't about user convenience...