[galacticpony]

...even for a team of one developer!

Look, I understand how one might like HTML imports. Once you've gone down the rabbit hole of Web technology, all the fancy experimental features make it look like HTML/CSS are now adequate. They're not. It's a trap.

The real answer is writing Javascript (or something that compiles to Javascript). Always has been, always will be. Don't trust the web consortium to specify things that maybe browser vendors will implement. Do it yourself now, thank yourself later.

[AshleysBrain]

We took the same bet with CSS grid, and it paid off. Lots of features can make a massive improvement to the development experience. We used a wide range of experimental features starting around 2014. Most of them came to fruition. HTML imports has been the only tricky one so far, which I think is a pretty great result on all the bets we took.

[Kiro]

What are you trying to achieve here? Make them rewrite the whole project from scratch? You made your point clear in your first reply.