That's a nice demo!
There have been plans to adapt this video expansion chip to the Amstrad CPC, but I'm not very confident in its success there. The CPC scene is all about squeezing every drop of power from non-expanded original hardware, even though expansions exist and are owned by many (extra ROM/RAM is super common for example). The only expansion demo-ers and game devs sometimes indulge in is the external 3.5 floppy drive and its extra space. but even that is uncommon.
It's cool that the MSX scene is more open about expansion hardware, and tries to make the most of it!
I get that if you're developing stuff for an already limited audience, that you don't want to narrow it down even further by adding extra system requirements like (often pricey) expansions.
In the current MSX scene, there's also a faction of people trying to squeeze the maximum out of the minimum specs. Meaning making MSX1 compatible games.
But if you think about it for a moment: even professional game developers like Konami and Hudson used the expandibility of the computer's architecture to their advantage. E.g. you got the Konami SCC built in into several of their later MSX2 games, even got a Laser Disc game, you got Hudson's BeeCard experiments, and of course there's plenty of cassette and floppy disk games out there. So why would you, as a homebrew developer limited yourself to the absolute minimum?
