Don't just say it, as one of the security measures, you truly need to learn Linux if you are involved in cryptocurrencies. It's not that hard. But if you really need to run Windows, you can run it as a VM within your Linux OS. It's much safer.
I would never use Windows + Chrome/Firefox for my exchange/banking/Bitcoin needs, it's just a security hole, and a hack/malware waiting to happen.
I think that kind of observation is a bit radical!
Regardless of the system used, security begins with user behavior. If the person has a bad behavior, he is subject to problems, regardless of the system he has. It is true that one or another system can make it difficult to have problems, but they are not infallible.
Safety is always related to the behavior that the person has!
But isn't choosing the best technical approach for securing your system also part of human behavior? In Bitcoin, we like say "Be your own Bank", and that we should take absolute responsibility for private keys. Plus between overshooting or undershooting system security, it's definitely better to overshoot especially if you HODL a large amount of Bitcoin, OR if you're holding other people's Bitcoin like OP.