You should only change distros because you friggin feel like it. Don't gatekeep man, it's fun to try new things, especially when they are neato free and useful. Be supportive of exploration, that's how new things get discovered.
This isn't sarcasm - operating system isn't a toy. Most people aren't using OS just for the sake of it. It's a tool to run stuff you need for work/entertainment
There's no harm in trying out a lot of different distros for the fun of it if that's what you find entertaining, and it's educational to see the state of what's out there.
Not needing to stay locked to a specific distro is part of why Linux is great, and very unlike Mac or Windows.
If you like being loyal then be loyal, that's a fine choice too, and freedom of choice is what this is all about.