Don't even think about it. There are situations where a repair outfit will not work (sidewall damage, large hole etc) and then you are totally stuck. I had a puncture in France which wrecked the tyre, the nearest tyre dealer was 40 miles away and it took them 2 days to get me a tyre; without a spare, albeit a temporary spare, I would have been lumbered.
My car came with one of those small temporary space saver spare wheel. The space it occupied in the boot floor was big enough to take a full size spare wheel. I bought a tyre and and full size wheel to replace it.
Is it possible to have both a spare wheel and one of those injection repair outfits in your car? I'm thinking that you might have a puncture on a dark, country road on a rainy night. You can't see where to place the jack, and you can't read the handbook properly, and getting down on your knees is killing you. A quick squirt
with one of those injection things, and you're away. If conditions are better, a change of wheel is the best way to fix the problem.
I carry both a spare wheel and a couple of cans of sealant, bookbinder - as you say the sealant might enable me to limp to a more suitable place for a wheel change.
There's no reason at all why you can't have both; I do. This came about by accident as I ordered my car with a spare (as a no-cost option) but it was delivered with a repair kit. I complained and was given a spare wheel and jack. I have no intention of ever using the kit partly because it makes the type unrepairable.
You can buy blow-up kits from stores such as Halfords but remember that you will also need a pump and it might not work.
They are NOT a repair outfit. It is just a temporary measure to get you to a garage or repair shop. As said once the 'repair outfit' has been used the tyre is useless. It has to be scrapped. But changing to a proper spare wheel means you can take the punctured tyre to be repaired.
No. Not in a million lifetimes.
One needs to ditch the repair outfits and Noddy spare wheels to where the car sales team tell one that the sun doesn't shine for them, and demand a proper product for one's money.
Broken down vehicles at the side of the road are quite common still, but mostly they are not non runners but have a flat tyre and no spare...just saying.