Yes I have no interest in having a browser in the way. But 2 things. Firstly CATIA in a browser is just the same CATIA running on a remote PC somewhere. It’s the same program. And secondly, as longvas the UI looks and works the same, with no delays, then it’ll be fine. Sure you can’t use it when your wifi or Internet is down or slow, or the provider has power or Internet issues. And your customer is not a military or super secrecy case. But its clearly expecting to find a market.

I use commercial CAD. CATIA for car bodies. There is no FOSS alternative that comes close for my work. But the light at the end of the tunnel is, many CAD systems, including CATIA, are going web based. So users just need a browser on any OS. And the back end can be what it wants.