Conversions API may not solve for data loss from iOS opt-outs, but it's still important.
If you use the Conversions API for web events in addition to the pixel, you're more likely to get a complete -- or close to complete -- picture of traffic conversions.
This impacts optimization, attribution, and website custom audiences. I break it down in this video.
I discuss this more here:
https://www.jonloomer.com/importance-of-the-facebook-conversions-api/
