I don't think I'd use that ever, in any preset, ever.
Nobody would be forcing you.
Apart from that, this is the very situation I am right now running into, maybe this explains how this could easily become highly useful:
I have a patch on my Stomp that I'd like to use all throughout the gig. I will defenitely have to do some last minute/second modifications during soundcheck as this suitcase rig has never seen a stage yet, that's why I can't afford setting up multiple patches.
Now, all blocks are used up, but I'd absolutely like to have a phaser instead of that spacey delay on two songs. What to do? Copy the patch and replace delay with phaser, right. But in case I'd do modifications to the main patch (the delay one), I would have to save and copy that patch again, exchange the delay in favour of the phaser, re-save. Etc. Absolutely impossible during a sort of "rehearsal soundcheck".
With global blocks it'd be a piece of cake. I'd set all blocks but the spacey delay to "global", copy the patch, replace delay with phaser and call it a day. Each modification to all blocks but the phaser/delay one will now be reflected in either patch.
Absolutely impossible to work around that with the current line of HX family members.