Not sure where you’re getting that idea about Broom Boy™. I just presumed he has latent Force abilities that are just beginning to wake up and nobody around him has picked up on it yet. Just like that kid from Tatooine who was pretty good at Pod Racing. 😉
It’s not like anybody is actively looking for Force sensitive kids at this point, at least not yet.
I’m merely projecting my own biases. I like the original idea of the Force circa '77-'80 ie an energy field that can be tapped into by anyone with the discipline/openness to do so (I believe GL called it ‘space yoga’). Yes, there was the implication that Luke had somewhat inherited his Dad’s talent, but it was still ambiguous enough to a) not be a given and b) be a potential talent that still required serious training to bloom beyond good piloting instincts.
Anakin was of course an outgrowth of the genetic certainty presented in ROTJ via the shoehorned Leia revelation. The original ‘other’ was to be someone who had trained on the other side of the galaxy - ‘trained’ being the operative word. Leia’s sudden identity switch necessitated the idea of Skywalkers being a threat to the Emperor by birthright alone. So at this point Force abilities became more strictly genetic, and this led us down Midichlorian avenue.
Anakin was conceived by Midichlorians to fulfil a Jedi prophecy - all of which I find ridiculous, but he was still only displaying rudimentary prescience (in the form of dreams) and excellent reflexes. I just find levitating objects to be a little far-fetched, especially given Luke’s slow climb to levitation proficiency. Since TFA and TLJ seemed to be ducking the ‘chosen one’/Midichlorian thing and going back to the energy field, I thought they’d also preserve the discipline/space yoga side of the Force as well. Rey’s heaving boulders about the place and Broom Boy effortlessly summoning a broom conflict with the ideas presented in the OT in my opinion. I don’t think these powers should be so superhero-ish, given what we’ve seen before. They should be earned, not just appear like Marvel mutant abilities.