Hi, we don't use Nitropack.I had someone optimize my site for Core Vitals not too long ago. Yeah they deleted many important plugins. For example, Yoast was slowing down the site. So they just deleted the plugin and wiped out most of my on-page SEO eventually tanking the site to the depths of Google.
Hows your process? Do you make optimizations like removing plugins that insert data?
Also want to make sure you're not using something like Nitropack that tricks Google instead of actually speeding up the site.