Best demos

The capabilities of MSX1 are quite exploited, look at Riyad from Bandwagon, and other demos. In my opinion there is still lot to discover for MSX2 and up. Plenty of registers to play with, and for sure we will stumble on some undocumented features / bugs , it is how you see it. We can achieve a lot with V9938 and V9958, more than we currently know, I'm sure. Like image zooming in screen 0, image is created by combining font characters and font changing ( I'm testing this)
Capabilities for screen 10+, and better PSG chiptunes. We can think of so many thing to try,
But do we see part of demos back in games?? Isn't that the goal, show what is possible and use for game.
I have been working on sound and disk usage, and I think it is almost possible, if some disk routines are rewritten, and interiupt is not stalled too long, ..

I honestly think that there are still amazing things that can be done with a barebones MSX1 machine that we could conceive of. So, nothing against MSX2 and above, but I hope there is people that would be willing to keep trying to still push for more and more impressive MSX1 demos

okay, let's talk https://www.youtube.com/watch?v=jcUyIz_0luw

That's a bit disingenuous to be honest.

Is it impressive? Sure! But, it relies on a lot of additional modern hardware that was absolutely unavailable at the time that these machines were on the market, and you should consider this 'outside of the specs' of the original machines.
If you would allow for this, then where would it stop. If I somehow find a way to plug the latest and greatest graphics card into an MSX machine and then claim we can do real-time ray-tracing at 4K on MSX?

So, no, this absolutely not equivalent to running the Second Reality demo on an MSX machine.

Another counter example is this one: Playing Doom on the ZX Spectrum Next at 7MHZ accelerated mode
As impressive as it is, no-one would say that this is proof that you can properly run Doom on a ZX Spectrum.

I can remember also some starwars video, played in combination with cd or dvd. That's the problem nowadays, technology, what is the max. baseline? The more memory video or ram, separate, independent processor for audio / graphics (gpu) and drive, the more graphics you can compress and decompress, place into memory, with sprite splits and line interrupts and higher the id of videochip , layers etc you can amaze more and more people.
What is the base line for demos for MSX, MSX2, MSX2+, and TR? VDP, DOS version, expansions? What about running in emulator? MSX1 with V9958 ? Or even MSX2 with V9958, I could not emulate this.
Have to test on my Sony HB700 with switches 7mhz and 2+.