Very laudable, though this is probably also part of the issue: If the client doesn't need any migration work, the dev doesn't get more money, which in turn might be phrased: "It is difficult to get a man to understand something, when his salary depends upon his not understanding it!" -- by someone other than me.

I have worked at employer, where one could have done the frontend easily in a traditional server side templating language since most of the pages where static information anyway and very little interactive. But instead of doing that and have 1 person do that, making an easily accessible and standard-conforming frontend, they decided to go with nextjs and required 3 people fulltime to maintain this, including all the usual churn and burn of updating dependencies and changing the "router" and stuff. Porting a menu from one instance of the frontend to another frontend took 3 weeks. Fixing a menu display bug after I reported it took 2 or 3 months.