I produce Joomla Extensions for my own use and amusement. I've been doing so since just after Mambo became Joomla v1. I share them in case anyone else finds them useful.
in general I am not responsive to suggestions for changes or improvements unless I would find it useful (although if you point out a bug or problem then I'll generally fix it)
Joomla 4 has been a long time coming and I've been looking at it since the first Beta came out. I can see that there are many improvements incorporated.
However there are also some things that have not been fixed and some changes that I find definitely for the worse. For example the new Admin template I think is horrible and a pointless learning curve to switch to.
More significantly the process of updating a J3 component to run on J4 is a complete nightmare, very poorly documented (as yet?) and a lot of work. Starting from scratch with a J4 native version of an existing component idea is equally fraught.
Since all of my sites run satisfactorily on J3 I see absolutely no reason to migrate any of them to J4. So I have no need to update any of my extensions to be J4 compatible. I also I have no desire to do the work involved.
Since I also recognise that the internet is completely unsustainable from an ecological whole systems point of view (where will the energy come from to make the stuff and run it?) I estimate that within 20 years it will no longer be functional. In this context my time is better spent growing food and living well within my eco-system than producing spurious updates of things that work.
Hence there will be NO Joomla4 versions of any of my components developed by me. Don't even waste your time asking. If you want to go ahead and do the work yourself then fill your boots. The code is available open source (GPL3). Just credit me with anything of mine you use.