Phishing emails are not threatening if they are received directly in the Spam folder of your email, but nowadays as I have noticed, some of these phishing emails are being shown in the Promoted tab in my Gmail which is surprising because Google isn't able to filter them out perfectly or maybe they are using some trick to get this done, but they should at least be able to filter the email addresses and send them to Spam if it is a regular email address.
Since I'm a bit experienced and already know about these things, it has never caused problems for me, but if the same thing happens to a newbie, receiving phishing emails in their main inbox or promotions tab, they will surely fall for them and lose their assets or accounts.