Idk that I'd consider them mutually exclusive, but I'm more than willing to admit that Mike is tremendously more experienced in this than I. Like not even comparably so.
I suppose "competitive" in both is the wrong word. Rather able to do both reliably, cost effectively, and making it fun. I think that's a fairly easy goal to accomplish. Afterall, we see it echoed over and over that it's best to track as close to possible until you find that something is limiting you. And i know people who are pretty skilled at HPDE, with room to grow still, who are running similar setups to what I proposed.
I certainly don't think an oil cooler is necessary for a Spec solo class, but I also don't see it adding any real benefit either. But having the allowance might make some people more inclined to participate in both activities though. It'd be a good way for the SCCA to encourage participation in both their Solo and PDX programs. Most guys I know that do both want an oil cooler for track days, which is a good idea, but are conflicted because of solo classing. You can always ask the people in your class if they don't mind, but it'd be nice to not have to deal with that.
I just think it makes sense in terms of the SCCA encouraging growth in as many of their programs as possible, especially seeing how many people take the path of autocross -> PDX -> club racing over time.
I know my notion of what a spec class would look like is probably far from perfect, but I think it makes decent sense.
P.S. typed this on my phone, and only half-assed on proofreading it, so please ignore any grammatical errors or seemingly rambling trains of thought.