There is absolutely no upside for IPS to invest one second into this project. IPS's only concern is with the new 4.x installs, which, by default automatically sets the character set to UTF8MB4.
When you upgraded from 3.x you had one shot at the conversion. This was not something IPS made a point of telling anyone., especially early adopters of 4.x.
Could they do this, sure, but again, there is no upside for IPS...