compent and full range speakers?
So just like people get a sub for boom, you also get tweeters for highs and woofers or mids for mid range frequencies. Each gets only the frequencies it was designed for, not other ones it cannot make.
You go to a steakhouse for steak, you go to Whataburger for burgers (and chicken biscuits). Not the other way around or one for both.
A coax speaker is a compromise. Put all frequencies into one unit and do all of them decently, but excel in none. Like TGI Fridays. Exception is any coax that has a crossover with it, like Infinity Kappas. Their coaxes started coming with crossovers a while back, and the function more like a component and less like a coax, so they say.
This says nothing of soundstage and space matching. Being able to move the tweeters away from the woofers is an advantage of its own. That is an entirely different discussion.

