I took a moment to think, but deep down I felt confident in my hardware wallet's security compared to hot wallets. However, he argued that it's best to split the Bitcoin into two parts and store them in two different hardware wallets.
You should not think about this twice. Having your coins on two or three cold wallets is better than having it on just a single wallet. To avoid backup complications, I have just one seed phrase with different passphrase for each wallet which I think is good than just having one wallet. So the backup will not be hard for me.
Although, if you have good security like 2-of-3 multisig with 2 online wallets and 1 hardware wallet, I think it is also good. But you will make sure that you avoid malware on the online wallets. Or you can make it 2 hardware wallets.
So it depends but not having your coin in one basket is better.
Sounds right to me.
And to keep your phrases secure is very important too - we saw what can happen if someone
their software onto your device.