TFP has evolved, yes. Have people in general evolved though? No. There are still just as many jerks, spammers, harassers, etc that we need to PM with warnings every day, and with the option to turn off the pop-up noptification most would never know they had a PM waiting for them.
Many people are not the same kind of upstanding forum citizen you are oldtimer
as for the 70, it's a multiplication of 2 of my favorite numbers, 7 and 10, and it started long ago with another name when it was already taken and I had to add a number. It just stuck, because what are the chances someone would have a 70 after their name?