I've read (and engaged with) everything in that issue, but I still don't understand the vague 'well the tag is just too loosely defined' argument. I mean, sure

I've read (and engaged with) everything in that issue, but I still don't understand the vague 'well the tag is just too loosely defined' argument. I mean, sure, there is some ambiguity around the exact limit of this tag, i.e., is it only meant for ways dedicated to rapid transit bus routes, or is it for ways dedicated to any bus performing a public transport role? That is a valid question (of the kind which tends to get answered in the OSM project with the passage of time and observing the actual usage of the tag), but, and at the end of the day, ways tagged with highway=busway are undeniably: a) roads; b) used by buses; c) unless otherwise indicated, not accessible to general traffic. Absolutely refusing to render even a simple line after three and a half years (despite two PRs provided) is hard to explain as anything but antagonistic gatekeeping behaviour.