I'm also sad a 2.4.0 is still not released.
Many people discover the ESP every day and faithfully install 2.3.0 version thinking it is recent, and then run into issues that have since been resolved.
E.g.
https://github.com/esp8266/Arduino/issues/26722.3.0 is more than 5 months old now and there are
so many fixes and improvements ready.
I wonder if the best wouldn't be to modify the readme.md and propose git as the first installation option, and only if it fails then propose to use the old 2.3.0 via the boards manager, indicating it has many known issues...
Vicne