Why not to use just Bitcoin Core? I don't see the benefit of using anything else.

How does a hardware wallet add security?

Just store your encrypted wallet on encrypted SLC flash card(s), hard drives, M-discs etc.

Why invent a wheel? Hardware wallets use flash memory, don't they? They degrade faster than
hard drives or M-discs.

Why add another company, or eBay/Amazon nefarious actors into the 'security' equation?

Hardware wallets might add convenience for some people, not security, IMHO.

Never give up control over your coins. Wasn't it the original idea?

PS. If someone steals your hardware wallet, or you lose it, your coins are gone.
If someone steals my hard drive, or my SD card, no problem, I'll just use the other copies
and move my coins to a new wallet and make new backups.