Sure I seen them play, they are good. They work as well together as you would expect from a national team. Still, chemistry isn't present like it would be for an NBA contender. You seem to underrate exactly how hard 16 teams fight to progress in the brackets and how it shapes each team year by year. You can have your opinion though, far be it by me to mock your bias.
Also if we assume everything is equal, they would have been through several years of early exits. By then, sure aftr a few of their players were traded then we might have a contender. They wouldnt be a national team anymore though.
P.S

first smily used so far

underrating NBA

naive

thinking national teams > good clubs