The vector extension is getting close to being formally submitted, so things should settle down. There was a major compatibility break a few weeks ago, but I'm hoping that was the last one. We won't know for sure until it is approved.
Vendors advertising vector support will have to maintain their own toolchains if they implement drafts. Most vector support is in IP cores, and they can be changed to follow the draft. There is no problem until someone makes an ASIC. Unfortunately Alibaba already did that and they are going to have lots of problems as they are incompatible with everyone else. But most everyone else is waiting for the official vector extension before making ASICs.
Vendors advertising vector support will have to maintain their own toolchains if they implement drafts. Most vector support is in IP cores, and they can be changed to follow the draft. There is no problem until someone makes an ASIC. Unfortunately Alibaba already did that and they are going to have lots of problems as they are incompatible with everyone else. But most everyone else is waiting for the official vector extension before making ASICs.