Because Quantum FUD is more dangerous than QC itself.
Putting aside nostr:nprofile1qqsrcn632cfyx5j0xpld9m389370ffuzgp8muwshvcrqgwm26sn7uacpzemhxue69uhkzarvv9ejumn0wd68ytnvv9hxgqg4waehxw309ajkgetw9ehx7um5wghxcctwvse30xkv's argument, because it is deeper than mine, and he's probably onto something I don't fully grok...
QC can't scale, because at scale thermodynamics takes over.
At scale, the cat is alive or it is dead.