Sure, you shouldn't just stick with the old and add features. You should focus an incremental rewrite to bring you closer to a switch to something supported early (e.g. dumping dependencies that won't migrate with you, preparing the code base for a quick conversion of incompatible language features, ...). Only few technologies are such dead-ends that isn't possible.

But once it's too late no migration strategy rids you of the old codebase and it's environment now. With the full rewrite you need to maintain and run it until that's done. With the strangler the old code still runs until it is replaced.

I'm so confused. What are you suggesting that's any different from what I said?

Apologies, then I must have misunderstood your original comment.

All good!