To me I find it harder to believe a shuttle could be found in immaculate condition with those huge wings and fin. I can headcannon that Vader’s personal TIE could’ve been stored in a more secure location which allowed it to survive the explosion (it’s still hard to suspend my disbelief on this but it’s better than nothing).
Also we see Kylo fly on TIEs a bunch in this movie, we see him go through two (now distinct!) TIEs, so it makes more sense to have Ben’s journey to Exegol be on a third and final TIE + the nostalgic imagery of Vader’s TIE right next to Luke’s X-wing feels more like the kind of thing they would’ve done for real for this particular movie.
I guess you could say it TIEs everything togehter… sorry.