No, I think it's not. Sometimes stronger words need to be used to get through people's thick skulls. Buying hardware first without doing proper investigation on what the status of Kodi and/or LibreELEC is, is no reason to come here and cry like a 4-year old asking for a bigger ice cream like some have already done.
Developers are people too, with families and jobs. I wish there were more, good quality, developers for Kodi / LibreELEC, but sadly, that is not the case. We have to manage with what we got, and if developers say that they limited time, then you will accept that. Don't also forget we have plenty of work on solving bugs in our existing projects for Generic, RPi and other AMlogic devices. Some of those bugs take weeks if not longer.
So just take a couple of deep breaths, and be thankful for all the work so far, as well as being a little less impatient.
I would just like to chime in to say that, while you make a relevant point, you are also missing a crucial point.
Since most manufacturers have stopped manufacturing MX3-G with the S812 chipset, and have all moved to the new S912 chipset it is only a matter of a short while before the S812 will be unavailable anywhere. Sure, you can get a few here and there but not for long.
I have a business that runs on MX-3 devices. I use a custom LibreElec branch that works with the S812 chipset. However I can no longer purchase these, my only option is S912.
I have developers that I pay handsomely for the work they do to create my Software, but they are unable to do anything without the supported libmali with fdev support.
It's not a matter of jumping on the latest trend. The manufacturers are the ones jumping. We are left to deal with it.