I think a straight reboot would be highly beneficial for a variety of reasons. The main one being keeping up with technological advancements, rather than trying to retrofit current tech understanding in to Trek tech.
Yes, not just tech but social changes (we wouldn't have to try to ignore the sexism in TOS anymore) and updated futurism (like transhumanism and AI being more commonplace than Trek showed). As well as history -- there are already a ton of events in Trek's past that are in our past now, like the Eugenics Wars, sleeper ships, the Millennium Gate, etc., and we're closing in on the Bell Riots.
They had four chances to do a straight-up reboot: in 1979, 1987, 2009, and 2017. Each time, they didn't. They chose something else or went with a half-measure.
As I mentioned, it seems like Roddenberry originally intended TNG to be a soft reboot, but later producers chose to tie it more closely into TOS continuity. Sometimes that happens -- something that was meant to be separate ends up getting folded in. It's happened repeatedly in the Japanese
Kamen Rider franchise. The first revival in the late '70s was meant as a reboot, but they decided halfway through the season to bring back the previous Kamen Riders from the original run and turn the reboot into a direct sequel. The second revival in the late '80s went nearly two whole seasons as a standalone, but then brought in all the past Riders for its climactic arc. And the third revival starting in 2000 went nine whole years before it started acknowledging the 20th-century shows as part of its past.
And sometimes something seems like a continuation at first, but then decides not to be. The short-lived
Spider-Man Unlimited animated series initially presented itself as a sequel to the more famous '90s animated series on the same network, even briefly quoting its theme music in the first episode, but it soon went off in its own incompatible direction and was clearly a separate continuity. (Or maybe that was always the plan and it was just faking being a continuation at first.)
Lots of fans want there to be a simple, black-and-white binary -- everything is either a pure continuation or a pure reboot. But many revivals, possibly most, have been somewhere in between the two, or have changed from one to the other.
At this point, I don't think they will. It seems like Star Trek is going to follow the Doctor Who model and keep building.
Hmm, maybe, but that just means fans will have to learn to become more flexible about continuity, because the inconsistencies are just going to get greater.
Doctor Who can get away with constantly rewriting its past because it never really tried to be consistent to begin with, and because it can use timeline changes as a handwave.