My selfish POV: currently writing a VST3 instrument plugin (now at "alpha" stage) the VST3 SDK and documentation are... not great... and it would be nice to have something different/better. I don't seem to be alone in thinking that VST3 is a developer headache, and that translates to difficulties for users when it works in one host but not another. Support for new proposed standards are always a chicken-and-egg situation but CLAP support looks worth considering.
VST3's been an interesting reminder for me about the often overlooked importance of quality documentation. Say what you like about Microsoft, at least they tell you how to use their APIs. Steinberg need competition at least to get them to pull their socks up in this regard.