As reliable as kwizard is maintaining them, I indeed would not suggest to rely on them, as there is not a QA and massive testing as at our official kernel contained. So it can be questioned if the major idea of an LTS kernel is covered when relying on the informally created LTS builds.
This topic came up often over time. It would indeed be nice to have an official LTS kernel, but this is to some extent contrary to the Fedora Project, and it would need a lot of resources to maintain it reliably to the level of the normal official kernel: Therefore, this can only start if you are (or found someone) who maintains such a kernel over time in a dedicated SIG and start collaborating with others to integrate it into the wider community and in QA. A lot of people would need to support this, and be ready to contribute resources, if it shall be reliable to the “official” level.
After allocating the major tasks and forming a SIG, the next step would be to find out how this could be embedded in the wider community, into QA, and how far others are interested in collaborating in terms of responding if an issue rises → embed into Fedora QA & issue handling, maintenance, etc.
My experience is that it takes years in which something (e.g., Silverblue, KDE or so → a kernel is impactful, so I don’t compare it with another package but rather a variant; still limited comparability, I know) has to be reliably embedded and maintained and proven able to respond when necessary until it is put to the “officially Fedora” section.
I presume the major reason why support is limited is that the official answer about LTS is, in short, CentOS or AlmaLinux or Rocky Linux.
I understand the desire for a Fedora userspace with an LTS kernel, but I am not sure if it is realistic at the moment to get everything together that would be necessary for that: I don’t think the demand is big enough nor are the returns of (resource) investment for people providing it.
However, I put this to the Project Discussion category to give it the possibility for review and see if others from the project want to say something more detailed about the backgrounds or maybe even think it could become possible. My perception is indeed that the issues with using always the most recent kernels have increased over time (this perception is both subjective and based on a “selective” set of data from Discourse and such though). In any case we have to keep in mind that what comes up in Discourse is just a small amount of the users of Fedora, and there will be always someone who experiences an issue when something is updated → that’s code.
I presume in the above you are asking for an official LTS kernel, beyond someone informally creating copr builds, because of your elaboration of the goals you want to achieve. Also, it should be clear that the above strongly simplifies, but I wanted to give an incentive of the overall issue and relations
I also forgot the space in between the words 
corrected, thanks 