Yes. I use an offline-only Pixel device with GrapheneOS for signing my transactions. I call it 'GrapheneSigner'. It's more secure than an old laptop with years behind in security updates or any Hardware wallet.
Discussion
A hardware wallet must have much less attack vector, just by logic. Again nobody would secure their keys in a old laptop
You shouldn't store your keys on any device. You should memorize your seedphrase and only use air-gapped laptop/phone/hardwarewallet to sign the transactions.
Hardware wallets are specialiced for that, laptops and phones are not. You go with your thing but doesn’t mean it is more secure or practical it is just what you want
Hardware wallets are ewaste and can be cracked (just go on Youtube and see). Also, most people buy their HW walletd with KYC, good luck when SHTF and gov comes to confiscate your coins.
Ok, looks like you are in paranoid phase. Blockstream or coldcard delete you data after 6 month and never been cracked. Phones are more insecure than HW, whatever way you wanna justify yourself. They cracked a trezor one with old firmware back in the days. All hardware becomes ewaste even you loved pixel lol
Can you prove they delete your data? No. If you paid you credit card then that transaction will be for ever saved.