Everyone is going to have their own takes, but I'll say that while Showcase matters, it's for a subset of users....just like Proxy.
Neither is worth holding up access to Agoura, Focus View and the things that 100 percent of the users will be working with every day.
Yeah, but even if you don't want all of that stuff....most folks want scribble strips...and only the XL will have that (I'm thinking no other units smaller are going to get it since even the regular Stadium doesn't have it).
So, if you want SS, no point wanting for something more tailored to your true needs and possibly lower cost - XL is it.