Well personally, I would rather just generate the seed myself and then import that into the hardware wallet device directly through its own user interface.
I wouldn't trust hardware wallets to generate my seed phrase due to the risk of tampered firmware.
If you don't trust a device to generate a seed for you, does it even make sense to enter a seed that you generated in some other way into that same device? If the firmware is malicious in any way, then it can compromise even the seed you enter into it.
An example is one of the better-known hardware wallets that has the possibility to send the seed from the device to third parties, which means that it does not matter at all whether you generated the same seed on the device or created it in some other way.