In the crypto market space, people's/user's trust is probably the biggest factor determining the success of a coin. So just the mere fact that bitcoin "started" this revolution, and everyone is merely "following" in it's footsteps (with obvious improvements in their approaches), it makes all kinds of sense why bitcoin still remains on the top of the chart, even after 10 years.

Usability, technology, security etc etc will all factor in at some point, but in the end, every successful coin will eventually be compared to where bitcoin stands no matter how improved the coin is. No matter how difficult circumstances and competition that coin had to overcome which bitcoin didn't have to. Kind of like how Lionel Messi will always be compared to Diego Maradona!!