I do believe her when she says that this has great sentimental value for her as well (although I'm equally certain that's not the whole truth), since the business value, as you said, isn't as huge anymore as it used to be before her re-recordings. But she bought back the rights to everything, including artwork, music videos etc., so she got back a lot more than what she possibly could "work around" by just re-recording the music. The re-recordings are really, really good (in a reverse-engineering sense concerning the production), and to a casual listener or untrained ear they might sound identical (apart from the stuff that's intentionally different), but they aren't and to me they sound just off. Swifties probably prefer the new versions for the reason you explained, but I like the originals more since every nuance is engrained in my brain and to me the tiny differences are throwing me off when listening to the new versions.

Looks like she sicked her fan club on her manager in 2019.

When is that in relation to "Bad Blood" and "the old Taylor can't come to the phone right now"?

Is it a different person who's now indignantly re-recording what they think are their songs; though many of them were indeed written by other people?