Often in computing, compatibility is highly desirable as it means you can launch a product to market with an existing software library to leverage which gives businesses a tremendous marketing edge.
To me the latest gen Sony consoles, for example, are handicapped by the library of PS5 games, but fortunately PS4 compatibility comes to the rescue.
Similarly, Creative Labs wouldn't have been as successful with Soundblaster had it not been able to implement OPL2/OPL3 used by Adlib which already had an extensive software library, and this is likely a better comparison as we're talking about 'optional accessories'. Today, sound cards aren't considered 'optional' on computers, but at their introduction, they absolutely were.
And if you go one step lower, in electronics, compatibility is premium. There is a reason everyone doesn't go and design their own version of USB - its a lot of extra cost to make uniquely incompatible chips that all perform the same function.
Sounds to me like Sony are just admitting that their implementation in PSVR1 was such hot garbage that they decided it was entirely a dead and and they've restarted from scratch.