It would not be a BAD thing if they conflicted directly with the Sequel Trilogy.
It would though, from Disney's perspective, and from an IP perspective. As soon as you do that, you have to start making major decisions about canon revisions and whether canon even still exists, and if it doesn't, that will actually piss off a lot of SW fans more than the ST ever did.
Plus Filoni is serious canon-guy and there's just no way.
In fact, enough people have disliked them, and they have caused enough division, that out and out ignoring them would not necessarily be a bad thing.
It would be, especially as you're making a huge assumption about movies all made incredible amounts of money and got seen by huge numbers of people, and despite supposed "dislike", moved insane amounts of merch, and further, some elements of which (Kylo Ren, for example), continue to move huge amounts of merch, which really undermines the claim that they're so disliked as to be delete-able. I mean, even if they made a Kylo Ren/Ben Solo movie now, they'd make fat stacks of cash on it.
Further, literally you're just running the same line that people did re: the PT in the mid-late 2000s. "Nobody likes them, they can just ignore them!", but neither Lucasfilm nor Disney agreed, nor would it make sense to.
Filoni particularly did kind of the exact opposite of what you're suggesting, and what people suggested should be done re: the PT, which is, instead of deleting or ignoring it, he nuanced and complicated it, added a whole ton of extra stuff to it, and kept adding until it started working better. Unclear if he'll do that with the ST, but an
Heir to the Empire type series could easily be part of that, continuing filling in the space between RotJ and TFA just as the Clone Wars stuff filled in between TPM, AotC, and RotS, and Rebels did between RotS and ANH. He's already doing that with Ahsoka and The Mandalorian even.
Find some way to unify and unite a divided fanbase would probably be one of the best things they've ever done since...well...since Spiderman: No Way Home (uniting all the Spiderman/Amazing Spiderman/Homecoming fans into one film group...that was one heck of a way to jumpstart the cinema's again after the Pandemic nigh killed them).
You're not going to do that by deleting the ST, dude. That's just wild. Again, the way Filoni rehabilitated the PT was to nuance and add to it, not to ignore or delete it.