BTW, @agutierrez welcome to the forum!
I don’t think it is a good idea to allow all messages from unknown contacts as you suggest, also I don’t even like the way contact requests work for contacts that use Delta Chat, because it could be abused by spammers anyway, so having all contact request in the contact request view(which needs improvements since currently it is only a bunch of messages) and make users more aware of contact requests in a way it isn’t disturbing like Make Contact Requests more visible or some other solution, could improve the UX.