{if email} no longer supported in comment entries tag???

Greetings – I still am having comment trouble since the upgrade to EE4. It appears that my own “{if email ==” phrases no longer work in the comment:entries tag. In the latest documentation, that conditional is listed under comment:preview, but it does not show up as an option for comment:entries. Was this an oversight? It has worked for the last ten years – since EE1. Why is it no longer supported?