I have never heard the Fluance speakers but have no doubt that they sound better than what the OP expected, given the cost. We often have a preconceived notion of what something should sound like based on what it costs.
Realistically, the 2 way small box monitor speaker has been around for over 75 years. Clearly some advances have been made in the areas of materials used for drivers and so on. Sometimes you don’t need to reinvent the wheel to get a good result.
I think we sometimes don’t consider how much of the final price comes is derived from the costs of relatively smaller production, based in Europe/USA, cost of marketing, dealer mark ups, distributor mark ups, component manufacturer’s mark up, R and D.
So along comes a little speaker, made in Asia, cheap labour, nothing innovative but using well proven 2 driver concepts, mass produced, with simple distribution and less dealer mark ups and we are surprised that it sounds good.
Is it high end groundbreaking reproduction, probably not. But did it provide a satisfying a listening experience to someone used to more expensive speakers whose cost is representative of the traditional high end manufacturing/distribution scheme. Apparently yes.