The concept of outgrowing a motorcycle is dumb and dangerous.
I'm gonna put my opinion on this trend here to hopefully open up the eyes of some new riders. As you delve into the motorcycle community (especially the online community) you will pick up on the idea that you should start on a "beginner bike" then you "outgrow" it and get something faster and faster and faster. Especially with the rise of motorcycle influencers, this creates the image that every rider is supposed to graduate up to a 1000cc supersport as an end goal. This is wrong.
Motorcycles are first and foremost, a mode of transportation. Once you restructure that idea in your brain you can compare them to cars. A Honda accord is perfectly capable of going the speed limit and above. You don't outgrow an accord and then get a Corvette. You just drive your reasonable vehicle unless you decide that you want a nicer or faster or bigger car. Similarly, once you are in the realm of motorcycles that are capable of sustaining the speed limit, the concept of outgrowing them becomes null. There's nothing wrong with wanting and being ready for something bigger, nicer or faster, but this outgrowing concept puts unnecessary and dangerous pressure on young new riders.
To wrap it up, new riders, get a 300, 400, 500 and don't think there's a whole new world out there once you can finally move up. It's being on 2 wheels that's the new world. Enjoy it, keep that bike for years or forever. Get a bigger bike when you want, can afford and are honestly ready for one. Not when ig motovloggers tell you it's time for your 600.