I think "growing out of" is true for those people, but not universally true
That is, not using tools isn't inherently a more mature way to practice, even if comes alongside craft progression for some people
For other people, they might start out not using tools, and then "grow into" using them. Using tools could be a sign of development in those people
Things that DO reflect an immature practice: buying new tools without having a planned purpose for them, thinking fancy = being a good magician (also, thinking NO tools = automatically being a good magician), buying new tools as a way to procrastinate actually practising, buying new tools because you feel external pressure to have a practice that looks like the ones you see on Instagram, being unable to practice when you don't have access to your tools.
There is a big difference between ENJOYING using tools and being DEPENDENT on using tools.
If you LIKE using tools, and are in a financial, geographic and social position where you can use them, but you choose not to, then you're just robbing yourself of enjoyment for no purpose, which isn't a virtue
If you DON'T like using tools, and you don't use them, then you're just doing what you like. Which is great, but not really any more mature than the person who likes using tools and does what they like.
In short, use or non-use of tools doesn't say anything about how advanced a practitioner is. Only their relationship to their tools or non-use of tools tells you anything about them