Bahahahahaahhahahah... no.
1 decent camera is enough if you are not a photographer, just a person who likes taking pictures.
As a very amateur photographer, I do in fact only own one camera. The rest of the two bags is accessories for that one camera and several lenses, each of which serve a unique and useful purpose. Good camera equipment is dammed expensive. If I could buy less of it and still do everything I want to do, you better believe I would! I don't even do very complicated photography. I shoot exclusively outdoors in relatively bright surroundings. There is a whole other realm of lighting equipment that I haven't even entered into yet.
And just for some perspective, it is not at all unusual for professional photographers to carry two cameras at the same time. (With different lenses, since it takes several seconds to swap a lens.)
And that doesn't get into specialty equipment like medium/full format.
My two small bags of equipment is nothing compared to the amount of gear that an experience professional photographer is likely to acquire over the course of a decade or two.
If only. I have several lenses for a variety of situations. A lighting rig for indoor shoots which includes bounces, tripods, umbrellas, cords and rigging. Then there's the tripod, plus a back pack for the smaller stuff. Not to mention backdrop equipment.
There's a big difference between casual hobby and serious hobby.
Consider, nobody says you need an electron microscope to get serious about photography, but they can take some amazing photos even without using photons...
Even professional photographers that only do a specific kind of photography professional nearly always have amateur interests in other photographic subjects that require different gear.
I have even known someone to go the other way and sell off there kit for a point and shoot. They where into candid photos so always having a camera was more important than fiddling with a massive beast.
Granted, camera's are cheap to most of the HN crowd, even blowing 30k over 20 years is just not a big deal. But, just because gear is 'cheap' and 'better' does not make it necessary.
aka all hiking/ backpacking gear for a world tour can easily fit into a single backpack or fill a trailer.
Photography, 1 decent camera is really enough.
A single bike is actually fairly small. Start getting into road bikes, touring bikes, etc and they start taking up a lot of space.
DIY can take endless space, but you can get far with a single tool box. 'extra' is often more about saving time than really necessary.
PS: I good rule of thumb is if you have not used it in 2 years it's wasting space. But, IMO even better is if you have used it less than 3 times in a year it's fluff.