We should probably get some feedback from a few customers on the rfc regarding your point @juliandunn .

My take is that Windows actually attempts to make these things all look the same -- for example, software patches, installed + available software, and Windows features (through the "Turn Windows features on or off" item) are all shown in the same gui app, Add / Remove programs (appwiz.cpl). My insider claim on the reason that these things do have different guis (dism and add / remove programs for windows featuers, server manager roles, msi's, etc.) is not because these are conceptually different, it just reflects product group boundaries (e.g. server manager was explicitly developed by the Windows Server group separately from concepts promoted by the core Windows group). 

Ultimately if we talk to some customers and they are more comfortable with these as separate resources, that's something we need to take into account. I do think having similar idioms across *nix and Windows is preferable, but if it causes usability issues I could sacrifice it.