I think old versions are hated because security exploits.
Because security exploits will stole your money, encyrpt all information, damage your computer, burn your house, give your all information and secrets to darkweb, will destroy you slowly, and your family (!).
Security exploits are overrated, they can damage your computer but, if you don't download viruses and scan all unknown files, any virus will infect you.
You can infect a computer with a lot security precautions if you don't care about security. Anybody can write a "virus" that blocks your input and logs you off so you can lose all your unsaved work. Antiviruses will not detect it because it will use very "innocent" functions. So if you are careful, you can use old versions. And if you aren't careful, you can get viruses with a lot of security.