Building is not any less important now, AI just highlights this fact. The software I work on is the difference between people getting paid or not, which those people consider very important - I use AI to do that by letting it improve the quality of the software, with less bugs, more performance etc.

The 10000th social media spammming SaaS being built in public is no less important now than it was before AI - we can just see how irrelevant it is now that it can also be built faster, by virtually anybody.