I've been making an SPG blend for a while on and off based on proportions my buddy used for his brisket rub. Sometime last year he started keeping a whole jar of it on hand and seasoning everything savory with it rather than just using salt when it's called for. The biggest difference between his and mine is that he uses sea salt and I use regular table salt. The flavor is slightly different and I don't get the big crystals, but it's still pretty great.

He turned me into a believer. I've started keeping my own jar and that's my base spice for everything. Chicken, fish, beef, pork, veggies, whatever. Most things get extra like paprika, chili powder, oregano, parsley, or whatever the meat calls for, but everything gets at least those three. Even my homemade mayo gets it, which means it goes on all my sandwiches as well.