Paul Farquhar
Legend
None of these are significant in number compared to new players and people new to DMing.Don't forget that "new players" may include people who are new to D&D but not RPGs in general, people who are new to DMing but not to D&D, people who are new to building a setting but not D&D, and people who are seasoned worldbuilders but not used to worldbuilding for D&D
And they don’t need a lesson anyway.
One of D&D’s biggest problems is a shortage of DMs. Presenting world building as something that requires a lot of work is the last thing WotC needs to be doing.