The fact, that there are any number of possibilities to "pretend" you're using a bridge camera, is obvious. If the other gear creates better results, whether it's more expensive or not, then by all means use it. But if you have that prime lens mounted doing say "street" photography and a UFO suddenly appears off in the distance, what do you do? Run back to the car, or home, to get your monster two foot long mega zoom? By the time you get back you're huffing and puffing and can't hold that monster steady. Alas, it doesn't matter anyway, now the UFO is out of sight. Well, maybe that first shot taken with the prime can be cropped to 800% and have more than a few pixels. But it's not over, suddenly the UFO streaks between the rooftops, when a small item falls from the craft. You rush over, not wanting to touch it and can't read the tiny writing. You've got just the cure, a small macro lens, back at the car, or home, you start to run................
Next time that won't happen. You've got this three tiered backpack that will hold all the lens possibilities. Only weighs 30lbs. or stones for you U.K. guys.
The truth is there are some mid zooms now that have great macro ability too, over on that "pretend" forum.
(I'm joking guys. To me photography is just for fun, not a job)