Thanks very much for the advice and the assurances. I didn’t make clear in my OP that effectively if I got a hub in my original plan, I was going to be plugging it into a USB 2.0 port on the front of my computer. The only USB ports left open are just three 2.0 ports and a USB-C port on front and just one USB 3.0 port on the back.
The worry in my original post was basically what happens if I plug FOUR USB 2.0 controllers into ONE USB 2.0 port thru a USB hub.
What I’ve decided to do is get another powered, switchable Sabrent USB 3.0 hub, a USB 3.0 to USB-C adapter plug and plug the hub thru the adapter into the front of my computer. All the flight controllers that I plug into the four USB 3.0 ports on the hub should be guaranteed to behave as if they were talking to the computer through their very own port and I can switch the whole thing off by the individual port switches on the Sabrent and unplugging the AC adapter, saving some juice (and global CO2) most of the hours of the day when I’m not gaming. I can probably daisy chain on at least one more powered USB 3.0 hub to gain additional ports if I need them without worrying about controller performance on a USB 3.0 daisy chain and the powered aspect of the Sabrent hub and its powered USB ports allows me to charge any USB device that needs charging like my cell phone, hearing aid devices, or watch, if I want. *** CORRECTION BELOW
And I’ll free up the (“useless”) three USB 2.0 ports on the front of my computer, still having just that one remaining USB 3.0 port open on the back of my computer. And I’m going to gain a bunch of powered USB 3.0 ports at the expense of my one USB-C port built directly into my computer. (no PCIe slots left for a USB card and I’m not sure if such would be as powered as those thru the hub). So perhaps I shouldn’t have worried about controller performance originally but I’ll be gaining a lot more expansion and versatility if I use my USB-C port for a powered, switchable USB 3.0 hub and would upgrade in the future to a USB-C hub if an inexpensive, powered switchable one wanders by! The whole purchase for a USB 3.0 hub and a 2-pk of USB 3.0 to USB-C adapters was $25 with free shipping.
Correction
The product literature says,
This 4-Port USB 3.0 Hub does not charge your devices (it can only sync).
and
For a stable connection, the devices connected to the 4-Port USB 3.0 Hub must not exceed a combined current of 5 volts 900 mAh.
Apparently, the supplied power adapter is only to assure that connected devices have 900 mAh current to divvy up amongst themselves. Normally, a USB-A port should be able to supply up to 500 mAh at 5 volts. Sorry for the egregious error. I do have devices like a barcode scanner and a (small) USB microphone array that are hooked up to and powered by the Sabrent hub that I already have (so I guess I haven’t exceeded a 900 mAh total current draw yet). https://www.techwalla.com/articles/what-is-the-power-output-for-a-usb-port