Sorry I don't understand most of your post. Porting CRT compatibility to other emulators, ok that I get is nice indeed!
Code news might be exciting for developers, but as an end user not knowing anything about that, all I can read is the same echo I got this past year and even before every time something about Groovy's development seemed to happen and ppl here got excited, yet every time I asked what was up all I got was the same kind of answers; vague, unrelatable.
In the past there was talk about things like beam racing, or making the frame_delay+vsync_offset relationship 'automatic', or even kill the remaining BGFX lag (eventually switching to BGFX as a whole with the same features and performance we get from 9ex now) etc
So I don't know, if you tell me it's more or less related to one of these I'll share the excitement, but as you guys present it now it's still too occult for me.
Understand that from an end user perspective the exciting recent (Groovy)MAME news were the vsync_slider, and update to CPU% one, both game-changing features I've been waiting to happen as the final touches that make Groovy definitely easily and useable in full without hassle (and for anyone down to complete noobs)
It's arrived kind of too late if you think community-wise and the aging crowd that lost interest in arcades emulation and even games period, for the remaining demographics still playing with emulators which is like 95% of end users if not more, RA finished establishing itself as the standard like 2 years ago and today it's not even worth arguing with them that there is something better out there they can use without needing to learn 5 pages of training, nor buy expensive FPGA setups, but still I'm glad it finally happened anyway.
(ps: that's not a criticism, calamity & helpers is only a semi-handful of ppl, can't be helped if neither MAME nor anything else can beat the RA train in popularity and activity speed. plus them, don't have much actual dev work to do in comparison)
Anyway for me it's full circle - as far as MAME and old designs go - from about 2005 when I started being annoyed with MAME's lackings, to Groovy 0.227, all the important boxes that needed to be ticked, have been by Calamity & Co.
(I'll write a summary of these soon)