I use carbide for everything, lasts longer and cuts more stuff...you can also cut faster and harder with carbide.
If you have the experience you have put forth you should know this.
You're exactly right, carbide is better in pretty much every way except for price, which I why I've only ever used carbide. 2-3x faster speeds? More rigid? Lasts longer than HSS? Be more productive with your hourly shop rate than HSS? Carbide is definitely the way to go generally speaking. I only asked about Cobalt HSS specifically compared to other materials because I wasn't familiar with Cobalt specifically.