Their CEO would call this a very trivial thing, and realistically for anyone who has any understanding of the things around them, it would never occur to them to download any upgrade through the links they received in the e-mail.
What is trivial for one user may be something extraordinary for another.
With each bullrun, more and more newcomers come to the cryptoindustry, who don't have the skills and knowledge of "trivial things", and who find themselves under attack from such phishing attacks.
Besides, is it so difficult to go to the official website and see if there are any notifications there?
Here, simple human laziness and inability to double-check all events related to finances are evident. And also, the "panic-inducing text" used in the e-mail, pushing to quickly make an update (risks of losing the contents of the wallet), which pushes the user to ignore the "voice of reason" and not check the authenticity of the information on the official website.
Phishing is really a trap only for the careless and naive, but considering the alleged millions of devices sold, if only 0.1% fall for this kind of trick, someone will earn a lot of money.
In the "fishing net" of phishing, one way or another, someone will get caught, because not all buyers of ledger's device are technically literate.