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The same theoretical QC vulnerability applies to P2PK keys, used by early Bitcoin client where Satoshi's coins are held. I think these are better target than Taproot keys.
Taproot is not default in the Trezor Suite because rest of the ecosystem (exchanges, wallets) are slow in adopting Taproot making it hard for people using Suite to accept payments. QC is not the reason why Taproot is not default.