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@Dammit
The tape is double sided, you wrap a length round the rim leaving the valve hole uncovered, then peal back the backing tape for ~3 inches either side of said hole.
Slide the tub on, give it a couple of strokes of the pump just so it's round, then pull the backing tape off whilst keeping the tyre centred.
It's similar too, but not the same as, sliding your thumbs round a clincher to seat it in the bead after changing a tube- but without the (sometimes) requirement to use a tyre lever+swearing to get the last bit of bead over, and takes around the same time.
You could certainly change a loose clincher faster, but a tight one would be slower.
I've never had to change one out on the road- the sealant has always sorted things out, so I can't give a view on that.
I used to carry a spare tub+cut to length tape, but now I just carry a tin of sealant for that bike.
When going into the countryside I still take a spare pre-glued tub (as that bike doesn't use tape).
I was running at 120 PSI to avoid pinch flats- that worked well!