The movies are interesting because they really don't fit in the timeline and never did. I've watched retrospectives and they pretty much their own DBZ timeline with recurring characters like Icarus. So while they added to, it never fucked with the main series like all this new bullshit has.

It really comes down to Toyotarou who started this. He was reopening the series when he wrote Dragon Ball AF and then he made all his fan stuff canon when he took on Super. Did we all really need Xicor to be canon? It's such a mess at this there really is no "canon" to follow.

It's very similar to how they handled the Aliens movie series. There's so many spinoffs, novels that are canon or not depending on the week, the rpg which canonizes some of the comics and unfilmed scripts. videogame timelines etc. At the end of the day I just ignore it and pick and choose what I like.