but also way more expensive for Bitcoin's growth prospects as new users get turned away or fed up. Cripplecoin, in the long run, fails to the benefit of Blockstreams SC project.
you keep ignoring the fact that miners can filter spam; if they want.
Miners can't filter spam without also filtering valid transactions, because they are indistinguishable.
Users will not get turned away, because where there is a demand, innovators will spring to life to supply ita.k.a. a free marketyour jealously of innovators notwithstanding.