I bought one a couple of years ago, to my surprise it was nearly identical. A bit cheaper material. Still over a 100 USD.
The difference is one can by an Aula for less than half the price, with better 3 Bluetooth settings + 2.4 dongle, blacklit, better sound coming out of the keys, less loud and annoying.
A great company that made the mistake to stay stagnant.
It's definitely not a market where one can stand still.
I agree with op who said that they aren't getting better but calling it stagnant is more than I would say. The build quality was quite high and they clearly focused on that, and the price reflected that. I own another mechanical keyboard that I bought from Amazon during the pandemic and I already started getting ghost tapping (I only used it for dev work so I was more than a little annoyed to see it).
Not saying it is perfect though. They clearly were a Windows-first shop and that never changed. I've never managed to get the 変換 key and the other Kanji keys working in Linux or on Mac, much to my annoyance.
Problems with the circuit board or the firmware it runs are certainly possible of course, but what I've seen most of are switch issues.
I'd absolutely buy another one of these right now if it were showing even the slightest signs of wear, but it's not. Bulletproof. The only keyboard I still use that's older is a Model M.
Filco really put quality first. It's a shame to see them go.