An antivirus will inspect opened files / network data flaw (audio/video files can be stored elsewhere (NAS / Radio / Web / ...)) / ...
This can potentially add latency and some stability problems (system & software).
I never used any antivirus on my MC station (dedicated to MC stuff only)... and never got issues with "virus".
A good thing is to place your MC station behind a firewall + place both MC station and storage on the same (v)LAN.
A firewall stops attacks from the outside. By far the most threats these days come from the inside. A firewall doesn't stop malicious code on webpages you visit. Advertisement providers (banners on websites) can be infected but also some websites can be hacked and code injected into them. Even if you don't visit webpages, MC accesses the internet via API's for metadata and pictures and you could also simply miss-click and accidently open wiki, AMG or google via the links provided. All it takes is malicious banner or some evil code on that page and you're toast.
I'm not denying an antivirus program can't cause the problems you mention, but I think its a better practice to try and solve the problems rather than to remove antivirus altogether.
Generally speaking, advising to remove AV software is not good IMO. If it works for you that's cool but it shouldn't be promoted as good practice.