We've had enough cases where other users can jump in and tell others to check likely suspects first, so they maybe don't have to nuke their entire installation. The mod team helps as best we can, but we are volunteers and not full-time tech support.

Then the devs browse the forums and leave answers for the maybe arcaner cases. The troubleshooting sections on Discord are also helpful, a lot of the official helpers there have a background in IT. That plus the collective knowledge of the Discord community usually means that even with mod issues, someone knows something (e.g. when it's a configuration issue, or mods a / b / c are known to not play nice with each other).

The official Valheim bugtracker is less for getting personal support (and shouldn't be used with mod issues), but it ultimately helps everyone when problems are described & upvoted there:
https://valheimbugs.featureupvote.com/