Brand new phone as a hardware wallet

Hi Guys, what's your view on using a brand new Android phone with Blue wallet as a cold storage/hardware wallet for Bitcoin?

• Buy a brand new low cost Android phone - Don't add a sim - Install blue wallet using wifi - - Disable/forget wifi - Put in Airplane mode (phone will never go back online)

• Generate seed - add passphrase - Scan QR of xpub thro regular phone - Receive funds through regular phone - send funds by signing transactions using the wallet phone using QR codes.

The entire process looks clean and easy.

Video help available here: https://youtu.be/f-8elm8xCLs?si=405XltHi63ydFQJW

Ben in the video talks about two disadvantages:

1. Phone doesn't have a secure element chip. So physical access to the phone by an expert may expose the keys. True. But we are anyway safe guarding the seed. We can as well safe guard the phone. Isn't it?

2. The phone may have already been infested - yes, if we are using an old phone for this. But if we buy a brand new phone from a reputed maker (like Samsung), we don't have this issue.

So you guys see any other drawbacks here?

Now to the advantages, why should we do this, if we already have hardware wallets in the Market?

1. Shelf life of hardware wallets - have seen a lot of posts about display issues, buttons not working, battery issue etc in hardware wallets after 2 or 3 years. An Android phone, not being used day to day, not connected to internet, no wear and tear of everyday usage, will easily live for 5 or even more years.

2. A single phone with single app can have multiple wallets created on it, and all can work in parallel, at the same time. A hardware wallet can hold only one key at a time. If I need to create a new wallet or import another existing wallet, the current wallet will no more be active.

3. Portability - I don't have to worry about carrying it in flights or concerned about any customs officer questioning. After all, it is just a phone.

4. We can go multisig if we want, using "Vault" feature of blue wallet.

5. Cost - a simple Android phone costs a lot lesser than the average price of a hardware wallet.

6. A little more privacy - a wallet company doesn't have my email/address/phone number.

Can you pls suggest what can go wrong with this ? It is indeed going against conventional ways of doing things (like using a hardware wallet) but given the above, shouldn't this be our primary mode of self custody?

Note: Though Blue wallet is bitcoin only, I recon there is Airgap wallet (https://airgap.it/) that supports all coins and they recommend using a phone as a hardware wallet.