When you have a team with predominantly back-end knowledge expertise using a templating language they are familiar with plays to their strengths. MVC applications were written for over a decade. Perhaps it is a subjective thing because I don't see any logical difficulty in a web page that exchanges partials instead of JSON. I was programming that way for over 10 years.

Svelte really sounds compelling from what you're telling me. I'll check it out. But unless it is a drastic simplification it brings with it the fundamentals of effectively writing a thick client in JavaScript or TypeScript and all the things that come with it. React and angular have left a very bad taste in my mouth. The time and code cost for building basic user interfaces should go down not up. We should be spending less time talking about how to do something and more time talking about what to do