For one thing, IBM got people to say "blockchain" instead of "blockchains" the same way that they got people to say "cloud" instead of "clouds" or "the cloud".

Blockchains attract people who know very little about computers or currency. You keep having the same discussions over and over again.

For instance there is the privacy maximalist who thinks Bitcoin is great because the U.S. government can't track his transactions. What he doesn't realize is that the blockchain is public so the U.S. government as well as the governments of France, China, Israel, Iran, organized criminals, extortionists, advertisers, spammers, etc. can all track his activity.