PipeDrive had this feature I used a while ago, it was a special BCC email address that if the subject was a contact in PipeDrive, it recorded the email message in our log.

I find myself wasting time copying and pasting emails into the comments of Simpleology Projects Cards.

I wish... all correspondence that I wanted in the Card of a Project I am working on with someone I can just do something like add in my email bcc box: bcc-ts-ly@simplology.com

ts-ly-website - I created when I created the bcc address for the card

so somehow on the card:
https://my.simpleology.com/#projects/123456/card/123456

I can create a bcc address to add to my email and it will send it and capture the message in the comments log.

https://www.pipedrive.com/en/features/email-dropbox

Pipedrive was so smart it just bcc everything and picked the ones with contacts and added it, so I didn't manually have to add one for each person.. however you could customize it... anything in this direction would be cool IMO