Basically the title. Every time I want to sign up for websites, the hardest and most time consuming part is choosing the username. I just never got why some people add seemingly random numbers in the end. I've always wanted the username to mean something or be special in a way. There have been times when I spent almost half an hour trying to come up with a better username, esp. on websites that don't allow you to change the username in the future.
How do you come up with your usernames? And is it really important in this day and age?
See this for example: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5742175/