P-REC won't work after the switch to 64 bits, the Valve developer who originally signed it doesn't work there anymore, and the current developers are not keen on signing it again (something something security something anti-cheat).
I've summarized the (important) issues from this thread: https://github.com/ValveSoftware/Source-1-Games/issues/5457
If you feel that something crucial is missing, please let it be known.
Somewhere in the thread, I've seen someone mention that they didn't want killstreaks to be recorded, you can put `ds_min_streak 999` in your config.
E: For what it's worth, there's a willingness from the developers to assist the migration off P-REC, so it's not like I'm screaming into the void