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None of these features require use of a HWW. They can be done using good software on any CPU. You don't have to be a "total tech pro" either. Just follow this guide to MAKE your own COLD wallet
When you get a new HWW from the manufactuer, you should really download the firmware, verify it, and re-flash the firmware yourself so you can verify that the device was not compromised in-transit. Sometimes new firmwares are released that fix vulnerabilities, so you should be downloading, verifying, and flashing to your HWW somewhat regularly anyways.
Flashing a new firmware on HWW isn't much different than downloading, verifying and booting TailsOS from a "tech" perspective.
Hardware wallets are simply the best option in terms of user-friendliness, usability, safety and price, period (if a renowned and praised hww is bought)
There's simply no arguing against, and sure, you can DIY it, but what do you win with it?
The best possible outcome is a working hww, the worst, total inaccessibility of funds, congratulations.
Seriously, if there's any serious money involved, a professional hww is the way to go, period.
I wouldn't say all the implementations are flawless.
In terms of different manufacturers?
Hm, a device that creates a root key with (probably) higher and more robust entropy than an amateur could, as well as a nigh-unlimited amount of keys and addresses in a secure and flawless way?
A second, third, fourth wallet with simple addition of a (new) passphrase?
A solid interface to interact with your Bitcoin?
It's simply the best option for anyone who's not a total pro in regards to tech, software and encryption, but who wants a secure and easy way of storing and interacting with his- or her funds; I definitely sleep better at night having an actually professional and tested, open-source hardware wallet, instead of some gimpy DIY...