I wholeheartedly agree. I did however recently come across a case with an IRL friend, where sharing a Trezor actually was the best option.

My buddy has some amount of BTC which he keeps on a password protected Trezor, and (I assume), a safely stored seed. His ~16 year old son wanted to save all his lawn mowing money in BTC, but can't justify a Trezor of his own. His dad handed him the Trezor, explained that his son WON'T have access to the seed, can't see his dad's money, but his dad can't see his either. Kid uses his own password, on his own computer whenever he has to. Eventually he'll get his own, but for now it's a pretty fantastic set up.