It’s not a matter of which is more or less important.
It’s a matter of time available to play and degree of ease to realize testing for different things. High leveled characters, testing high level implementations is a few steps to being done.
While creating a new alt, going through the tutorials, seeing the way it levels, following a path with many choices in how to level, seeing how fast you unlock certain recipes, and what are the first road blocks you find along the way. How can you bypass those roadblocks? By buying the ingredients, grinding away, trading? Then going from the low levels to the mid levels, and to the high levels. What progression you have on the high levels. Not to consider, the prices set on the current test version, will probably not represent the final prices, people will set when said release comes to live. Testing, analyzing your findings and offering options to those as a starting player is a more demanding task.
I’m sure there’s already people trying it out, but the release has only been out for less than 3 days. And things like those take time.
People are simply testing the high level things right now, because it’s easier to do than the later. It’s something new for their routine and gives them excitement. And it requires a lot of new materials to be done.