That alone would be manageable. Yet, this behavior is often expected from others too, which creates an environment that, at least to me, is incredibly suffocating. What's worse, such an environment caused two problems for me:
First, by upping the average of "relatively perceived as positive", objectively neutral people are perceived as negative. I've actually had colleagues go into emotional distress and vent to me over this.
Second, it at least seems like overly positive environments are afraid of criticism and critical people. As a critical person myself, it has been incredibly difficult to navigate such an environment and it lead to me essentially becoming an assembly line worker who "just shuts up and does their job". Also anecdotal, without critical people, going into the wrong direction either ends up being corrected very slowly, or not at all (and given how multi-dimensional work tends to be, going into the wrong or nowhere-near-optimal direction is very likely).
As a result, to me, no feedback at all is only slightly worse than overly frequent, overly positive feedback.
Most weeks at work are completely benign where we're not doing "amazing" work, we're doing "work". We're doing our salaried jobs as expected.
It's frustrating when every Jira ticket that gets closed is some moral victory that needs to be held high. It's not, it's our jobs and it's frustrating to deal with the faux positivity when I just want to do my job.
I used to be much more cynical about unwarranted praise/positivity. My mind has pretty much been changed by my current job, our team lead doesn't communicate how he's feeling to our team at all and this has had negatively affects on not just my morale/happiness but my teammates' as well.