For people who own a hardware wallet, why did you buy one?

I'm saving to buy my house, hopefully, in the future and I dca a little of BTC and ETH every month. I'm thinking of buying a SafePal (I accept suggestions). But I've read quite a few people recently getting hacked even with their funds still in their hardware wallets because they interacted directly with a dapp or something like that. But while I was reading and researching about wallets I saw this:

The hardware wallet has an anti-hacking system: to confirm a transfer to another wallet, you must press the buttons or the touch screen.

So like 2FA, but how it is possible? Apparently those hacks are not detected as transfers, right?

I've readed that it is recommended to have a hot wallet for exchanges/purchases/trades and then send it to the hardware wallet address that never interacts with anything. And revoke token approvals with etherscan or revoke(dot)cash.

But in that case why have a hardware wallet and not just a cold wallet in my phone? What exactly would a hardware wallet be useful for, does it protect us from something or is it just to have a physical device?