I would consider it a bad move, yes. Domain name branding is an important part of seo (search engine optimization.) You are your brand. People know you by who you are. They know your brand. Your trademarks. Your look. Your style. Your logo. Your brand name. Not having a domain name url that matches your brand is a huge mistake.
Domain name branding is also one of the few things that helps you to increase your organic search engine optimization.
Branding is something I stepped into by accident. I had not set out to brand myself or become a brand. I had not set out to be a business or make money online. It was something that happened on it's own over the course of time.
I started using the name EelKat in 1978. When I joined the internet in 1997, I used EelKat as my username, simply because it was easy to remember and all my friends and family knew me by that nickname, making it easy for them to find me online. It wasn't a business move when I did it, because back then, I was unknown and unheard of.
Or so I thought. I would eventually discover I was a lot more well known then I realized. Since the 1970s, there have existed rumours, that I had no idea where out there, until I encountered the people who believed them.
Since 1997 I have been "EelKat" online.
2007 I started getting paid for the tens of thousands of words I wrote online each month. After 10 years of not seeing a penny and not knowing writers were paid.
Ten years of being "EelKat" everywhere, people around the internet (strangers) also started to identify me as "EelKat" everywhere, the same way offline family and friends had done.
I was EelKat everywhere.
Except for 1 place.
Can you guess where that one place was?
I was EelKat everywhere. And nearly 20 years and 600+ social media and forum accounts all named "EelKat" later, in 2013, one of my readers asked me a very important question...
"How do I find your website?"
I answered back.
She replied back:
I said, "Because it was a location the book series I was promoting at the time (1997) was set it."
"But I never read those books, so how would I know that? Why aren't you on EelKat.com instead?"
A week later I bought EelKat.com and transferred my old site over to it.
Because she was right. People looking for me online Google the search term "EelKat" not "SpaceDock13".
The change of the url did amazing things to my traffic. I went from 300 page views total across ALL pages per month, to 300 page views per page, per day.
People were searching for "EelKat" not "SpaceDock13"
It was the same website.