This change is interesting. The process of creating parameterized blueprints looks a little tedious, but I'm pretty sure that's just inherent to the idea in general and there isn't much room to make it better, and I imagine the ease of using such blueprints that are e.g. downloaded from the internet is perfectly fine.

I play a lot of Factorio in multiplayer, with a group where not everyone has the same desire to make blueprints, and we in-general resist just downloading designs off the internet and try to do everything in-house. This leads to a lot of asymmetric gameplay, where e.g. I may design a blueprint and others will use them. I think this kind of change will work well overall for that (complex train systems are now a reality) but might come with the cost of the blueprint producer spending more time faffing around with the blueprint UI.

Sounds truly amazing! Missed that feature over the last years. Same for the train interrupt, which simplifies refueling.

When can we expect these features to arrive in-game?

I also wonder, isn't a follow-up game coming out soon? How long will they keep making Factorio even better?