Here are two examples from my mapping region in Germany. No physical barriers, just paint on the road and traffic signs. By the way, these used to be normal traffic lanes, but now they are bus lanes.
There are certainly better examples from Germany, this was just a brief insight.
For your interest, this is not a “BRT” by any standard. There’s no dedicated lanes, signal priority, or off-board payment and all-doors boarding. Japan is basically using it as a foreign buzzword for articulated bus, similar to how “LRT” simply means a modern (articulated) tram.
The only closest “BRT” example in Japan is not called a “BRT” from history, but a “trunk bus” system in Nagoya (officially “Key Route Bus”), specially the Route 2 corridor mostly on Aichi Prefecture Route 215 Dekimachi-doori (Avenue). Coincidentally, this is almost the same as the Korean term, except missing the “Express” word.
It has been drawn correctly with lanes:bus= , and only separate highway= road at bus stops Way: 出来町通 (667850633) | OpenStreetMap =service vs =busway should be discussed before Highway=busway on non-BRTs
There are a few other proper “BRT” systems in rural regions around the country, as a replacement bus service on closed rail lines. But their raison d’etre is weak, when the lack of traffic congestion means it’s not neccessary short and reliable travel time. Quite the opposite, the legacy from rail lines means they are often further away, not as convenient as bus stops on ordinary roads would be.
Wikipedia has a different edition for each language, not each country. This is only because it’s too hard to write an encyclopedia in a single language that everyone can understand well.
OpenStreetMap is very different: we all live on the same planet, so we try to coexist on the same map. We do have country-specific guidelines to help us interpret the global guidelines and adapt them to the situation on the ground in each country, while remaining compatible with the global guidelines. Do our tagging guidelines for South Korea need to be clarified or updated?
As you encounter mapping guidelines that don’t seem to make sense, please continue to calmly ask questions and provide examples. Just remember that any bias you see might be a simple mistake, or it may be for a good reason you haven’t thought of yet.
I think there might be an option with OSM that suits your needs.
Here in Ireland, we don’t have BRT and there are no real busways of any serious length. However, as we have a limited amount of urban railway, buses and bus lanes are common. Bus lanes are normally part of the main carriageway and usually separated by a thick solid white line, but occasionally there will be flexi-bollards to discourage cars from trespassing. There are a small number of bus-only streets, which prohibit general traffic, but allow deliveries and emergency vehicles.
Very occasionally, there will be a separate carriageway instead of a bus lane. These are designed to give the bus (and usually pedal cycles also) extra priority at junctions.
There is a Korean OSM group somewhere (Telegram? Facebook?) where OSM tagging is discussed.
The OP is complaining that the leaders / influential members in that group are discussing BRT tagging amongst themselves without discussing it with the global community.
The tagging that this group has formed consensus on is different from how BRTs are tagged in other mapping communities.