Earlier quoted context omitted.
This is very misleading. Cryptocurrencies developed on 10+ year old tech, that have stayed in that state throughout may indeed have very poor tps as you state. However, this is absolutely not the majority, as that base tech has iterated both at the base level, and in the application of layers. Typical these days are tps-handling in the 1k's - 10k's, and beyond. This will only keep improving as the technology progress…
Reversibility is the feature of credit cards, not drawback or limitation.
The necessity for reversibility, and the inflexibility of being limited either to it, or some form of it, is indicative of an inherent, unfixable flaw in the system itself.
This flaw limits the systems growth, adaptability, and usefulness.