I appreciate your intention and effort to clean things up and make OSM data more consistent. I want to tell you that your decision-making tree and guidelines revision work is great. It improved things, as you mentioned that it helped reduce mistagging.
You may be disappointed to discover that there are currently only a few OSM mappers in Thailand, compared to many years ago, and especially in compared to other developed countries. This resulted in some problems, such as not having enough people to discuss and vote on any issue in order to reach a consensus.
As a new mapper in comparison to many others in this community, I would encourage you to continue your work with, as OSM stated, “any tags you like” and perhaps provide some guidelines as well, as possible.
I agree on all of these points, but reaching a consensus may take some time.
Regards