WebP is good iff it improves rendering times (which it does). That's not google's fault really. Any way you can come up with to optimize images is valid under Core Web Vitals. I really don't think any of it is skewed towards Google's solutions except the testing/measurement methodology. I would love open source data collection across browsers for instance.

Lazy-loading can be implemented sloppily, but browser-native lazy loading is now good enough to be considered optimal.