I also read something along the lines of that they have do some EDA work either on windows or on special mac builds of the tools. Might be just gossip keep in mind, not that it matters (beyond ones religious devotion to mac)
Ultimately you often need a setup something like this as EDA vendors can have various rules to follow about where the binaries are kept. For implementation engineers there may be onerous terms around access to the process library files which are easier to deal with if the libraries plus the tools that use them don't go near the engineer's personal machine.
Plus an engineer may want to spin up multiple instances of tool (very common for simulation for instance) so you want easy access to a cluster for this purpose.