Ah....no? Cable is very cheap. Routing it is the harder part typically. I would always do a "home run" to every device if possible. You need power for the switch, a place, another thing to fail/check/replace, and cheap switches are...well...cheap. Why not get 100% of the network performance on each run? A switch will share that single run. Usually not an issue, but still less optimized.
If on the other hand, it is not possible or practical to run a cable to each device, a switch is the (only) way to go.
If buying cable, no reason not go CAT 6. Nearly the same cost, and handles higher data rates and longer runs a bit better.
Routing the physical cable is all about keeping it from being seen, or tripped on. Running through a plenum space is primo space. Also making sure that the cable isn't kinked when pulling. When running through wall plenum spaces, rigging up a strain relief to hold the cable so it doesn't pull out of the jack (You do use jacks and wall plates, don't you?) is half of the deal. The other half is getting the cable to where it needs to be. Don't be afraid of running the cable in out of the way places. You probably won't be running a new one for a while, if ever.
A home run is not necessary. You can, if you want, but at some point the multitude of cables becomes a logistic issue. THAT is why you would use a switch at the end of a longish run, or between congregations of nodes. Given that most switches work so fast, and the chances of hundreds of people being active between one end and the other of his shortish network segment run, I wouldn't think that traffic is an issue. And less optimized is a rather odd thing to say. But whatever.
Some cat6 cable is a real pain in the bottom to work with. Bonded pairs, stiffer, odd spacers, yada yada yada. Cat 6 is overkill in many applications. In my company, if the cat 5e didn't work (interference), we went immediately to fiber, as cat 6 isn't immune to interference anymore than cat 5e at many levels, and the other option of STP is a real bucket of poop when you try to use it. As a matter of fact, in my experience, most people screw up installing STP cable. I've run metallic thin wall conduit in some situations, but that is a real pain in the drain...
But, all that aside, I really like the bimbos, both male and female, that I hear at the local Worst Try, etc, declaring that wireless will 'Fix All Of Your Problems'.
Yeah... If I had a dollar for every person that went home with wireless gear and couldn't get it to work...
Oh, and why not cat 5e? The local Home Despot was blowing it out because 'everyone wants cat 6'. Yeah, and cat 5e for shortish, and clean runs is perfect...
But anyway. As with everything, your mileage may vary...