The majority of skilled developers prefer Macs or Linux. I've been at large conferences and not seen a single Windows machine. Some developers like Windows, that's fine, but just as many hate it. It's not wrong for a developer to use Windows, but it is wrong for a company to impose it, or even to have it as the default option.

For a company to say "at our company, we use Windows" is to say "We don't give a shit about developers". The issue isn't Windows, the issue is a workplace culture that places the preferences of management over the preferences of developers. Life is too short to work for people who don't respect you, especially when you've got one of the most valuable skills in the world.