I immediately repotted into a grow pot with more volume and proper bonsai soil. The pot it came with was a decent quality Chinese mass production piece that I will find a use for at some point so that added some to the value of the purchase but my goal is to try to get some decent growth out of this plant so the bonsai pot was not optimal for this stage. The soil was not bad but it had a high percentage of organic matter. This would be good enough for a beginner as you could miss a watering or two and not suffer but again, not the best for my purposes. I also wanted to get at the roots which can get out of control quickly with a trident so changing out the soil just made sense at the time.That's actually a pretty nice looking tree, would you be keeping or suggest keeping something like that in the small pot like that or take it out and repot in a net pot with looser substrate to grow a bit ?
So to answer your questions, it would really depend on what you want to do for this next season. You could absolutely leave it be and it would be healthy and happy in the pot and soil that it came in.