I don't see it that way. There are thousands of languages now. It's wise counsel to people (like me!) who hope to introduce a language that actually gets used. If you can't "check those boxes" on this handy checklist, well, maybe you gotta spend more time at the drawing board.

For those of us that are going to do it anyway, with no expectation of becoming popular and widely-used, I would treat it a stimulating challenge rather than a slammed door.