[sterex]

Having used loopback version 2, moving to version 3 was relatively easy. I don't think it will be the same from 3 to 4.

Introducing MVC architecture is good - I'm yet to go through the code, but I'm guessing this will be inline with how Laravel is built.

But, why TypeScript? This seems like a strange decision to me.

[STRML]

I've used Loopback for a while as well. IMO, TS is a welcome change, I'd be happy to write APIs in it and I'd prefer it to untyped libraries.

It's hard to understate how nice it is to have your editor autocomplete functions, argument order, object shape, etc. It's a real productivity booster, gets you sanity checking out of the gate and makes the framework discoverable. This is a good decision. I can't make any cogent argument against it, aside from dependency bloat.