The way Boss does it on the GT-1000 you have 10 slots per effects block type that you can save as a “Stompbox”. So you can freely use all the blocks in any preset, but you can load a Stompbox into a block and that will be effected by changes to that Stompbox. In my case, I typically have 4 presets that I use live that share clean and dirty amps and FX layouts, so when I’m tweaking a delay mix or amp gain or boost settings at rehearsal I don’t have to go make the same change across four presets to change my rhythm boost or whatever. And if I don’t want to use a blocks shared settings I just switch it from Stompbox to Patch Data and I can freely change the settings of the block without effecting other presets. So it’s not really “global blocks”, but block shared settings via an assigned location. If you don’t want a block to follow other blocks don’t assign it to a Stompbox location. I definitely wouldn’t want my delay to have to be the same thing across presets for everything that I load a delay on. But I can build as many “pedalboards” around the same amp setup, and if I need to change the amp settings at rehearsal it’s done for all my various fx configurations that I want to use with that amp setup. It is super duper handy and doesn’t limit anything.