I think their point is more putting technical or commercial feasibility aside, cartridges would be the better UX. I agree with that sentiment, cartidges are way cooler.

There are large communities around cassette futurism/retro futurism for a reason. There is something much more satisfying about thwacking in a cartridge than inserting a disk or just pressing play on a screen.

You are right that as things are disks make more sense, but it's a different discussion. what is vs what ought to be

In a perfect world I'd rather have storage crystals with programmable stable display voxels inside. But that's not realistic any time soon sadly.