I totally get this point of view, but at the same time, there’s clearly some sort of artist intent on using different names for different music. I wonder how hard would it be to have a plugin to always follow legal name relationships when tagging in Picard for example for people who prefer that consistency. @outsidecontext, how doable does that sound? 
Basically the main question here is “are the aliases different projects”, as usual In general, if the IPI is linked everywhere to the alias I’d add it to the alias, if it’s used for both I’d add it to both (we’re supposed to document reality, so even if IPIs should only apply to one artist, if in reality it’s more confusing than that, we can have it on both artists).