For me, it’s just a case of Fedora is supposed to be the latest and greatest without being a rolling release distro. I’m fine on the ESR release. But if it was put to a vote, I’d definitely vote in favour of having the latest version in Fedora’s repos.
From the previous thread I linked above and the thread rabbit hole from it, it looks that ESR was recommended by the Thunderbird team themselves, which they’ve only just changed recently as @l-c-g pointed out here.
So I think there is definitely a discussion to be had with regards to moving in line with Thunderbird’s official release recommendation.