Yeah tons of people use the label “bisexual” even though by strict definition they might actually be pan. And that’s totally fine, you don’t always have to use the most specific terminology.

Only eats at a restaurant that has at least one Michelin Star, wears only black socks, listens only to music that was popular when they were between the ages of 12-18 years old, insists that video games and cartoons peaked when they were age 22.

The "bi" part of bisexual implies a gender binary. Some people like that, some people don't. Pansexual is just an alternative that is explicit in its attraction to non-binary people. Some people aren't attracted to non-binary people, and use bisexual as a label to specifically mean only an attraction to men and women. Other people who might be described as pansexual describe themselves as bisexual simply because it is a more well known word. It all varies.

"Non superficial bisexual" isn't the worst definition of pansexual, but saying pansexual is shorter.

The way I (a bisexual) have always interpreted the difference is that pansexuals feel the same attraction to all genders and that bisexuals feel different attraction to different genders. I identify as bi because I definitely feel different kinds of attractions towards men, women and enby's.

From what I can tell bisexual can mean a couple of things depending on who you ask. Either an attraction to two genders eg. cis men and women, or perhaps an attraction to multiple but not all genders. Pansexual on the other hand means an attraction to all, including trans or nonbinary people, etc.