ALP replacing Leap?

I just want to ask, if leap is being discontinued and being replaced with alp, isn’t tumbleweed a better choice for those who want a mutable os?

While I can’t speak to your question of the future status of Leap, I can say as someone who historically has not been much of a rolling-release fan that Tumbleweed has actually been surprisingly solid so far for me. I am running it on the most pedestrian and likely-to-be-compatible hardware, so definitely YMMV applies to these comments.