Always? Have you seen "Tomorrow is Yesterday", "Yesteryear" or "Time Squared"?completely change the way time travel and timelines have always been portrayed
Trek time travel rules depend 100% on the writer-of-the-week and how they think it should work.
And that Picard is set in 2399, takes place after the supernova destroyed Romulus but not in the timeline where Vulcan was destroyed (and is part of the Star Trek Universe of shows run by ST'09 writer/producer Alex Kurtzman) says they're fine with how it all happened.