> A big impediment to moving away from SPAs is that we’ve collectively spent years building up an entire infrastructure of backend services which power the internet by communicating with browsers in JSON

Something I like about Django/DRF (and likely many others I haven’t used) is that it makes the above an imaginary problem. Django trivializes accepting form or Json or xml or whatnot. It just wants a Python object after deserialization and usually you can get a few of those formats for free, or otherwise very little work.