I use the Trezor for online buying on different platforms, but I still have online accounts to diversify a bit and to use different wallets for different projects or experiments. You do not want to have one device to

link all your online activities, because it increase the risk for hacking. I know it's not a fool proof method, but it's working sofar.

I use the Trezor for more secure transactions in higher amounts, but I always keep the main stash in cold storage not linked to it at all.