The only problem that I could forsee with logging onto a company network from a personal PC is that the personal PC could then be liable to the company’s IT rules. It would then be unsuable for “typical” family use.
I had this issue as a contractor when the company I was working at was being slow at providing me with a company PC account, so I had to work off my laptop and email the documents I was working on to the person I was working for. The IT manager suggested that I plug my laptop into the network, BUT my personal laptop would then be subject the the companies IT rules regarding downloading and using “unauthorised” software (any software on my laptop which was not used by the company was regarded as unauthorised), use of the internet and use of email. I wasn’t prepared to let them restrict the way I used my laptop, so said no.