To give some more context to the use of “Map builder” as editing software in OSM, we can look at some statistics from osm changeset. (Disclaimer: I created the statistics and website)

Looking at the usage, there was 1 contributor in 2021 (Map Builder User), 1506 contributors in 2022 and 890 contributors in January 2023. In total, 2376 contributors used Map builder. As of January 2023, it’s the 24th most used tool by total contributor count. Source: https://piebro.github.io/openstreetmap-statistics/#c229

Looking at the edit count: Map builder is the 98th most used editing software with 3768 edits in 2021, 69618 in 2022, 38954 in January 2023 and a total of 112340 edits. Source: https://piebro.github.io/openstreetmap-statistics/#eb30

It has gained in popularity in the last year. I hope these statistics can help with the discussion.