We took the plunge and replaced the 2-year-of-work React UI of our SaaS product with simple Django templates and htmx in a couple of months. Wed like to share our experience with you, with concrete indicators on various aspects, and convince your CTO!
Source: A Real World React -> htmx Port
HTMX is becoming pretty popular in Python world. I still think I prefer Hotwire, which is similar in some ways, but is much better for progressive enhancement among other things. In any case, I am happy to see this kind of approach becoming more common.