Maybe consider that we have literally hundreds of priority tasks, all of which are legitimately very important, and that while we can spend the time necessary to install and maintain non-turnkey solutions, we’d really prefer to work on one of the other priorities with that time.
There’s no such thing as general tech priorities, it’s just an amalgam of a bunch of individual priorities. In most of the cases I’ve seen those priorities are very reasonable. If you start a tech company and prioritize fiddling with internal messaging software over building your product, you’re going to fail. Prioritizing tech doesn’t mean yak shaving every random task, it means outsourcing as many non-essential tasks as you possibly can so that you have as much time and attention as possible for the one specific technical task that matters: building your product.
I don't think priorities shifted away from tech, they just moved up the value chain. Tech companies should focus their limited resources on building their core product, not managing "plumbing" like email servers or chat.