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The system I described seems much more fixed - once the vang was two blocked on the spacer, that boom had no ability to change vertical angle. No reliance on sensors, gas pressures, or playing with the topping lift needed. Most sailing the spacer could be left in, as the sail was cut slightly...

That's a very complicated system - lots of bits have to always operate properly

Having wrenched & delivered a 63' Dubois custom that had in boom furling: the angle of the boom to the mast is CRITICAL when lowering the sail. A wrong boom angle would cause the bolt rope to either creep forwards or aft. Forward, the roll would jam the gooseneck, aft, the bolt rope would pull...

The boat has a hydraulic vang, visible & un bent in pictures. So if the return gas pressure fails (never seen one fail catastrophically, usually slow leaking) the boom can fall untill the cylinder is tw0 blocked. Then it's rigidly supported again. Mainsheet still works - so boom can be hauled in...