I had faster internet than that former speed in Arkansas in 2006... By 78 I didn't use or intend megabits that was megabytes. That's 624 Mbps.
The deck doesn't have wifi 6, but all my other mobile things do except the e readers so that's why we have u6pro APs. Mind you we already had APs so...
I've had my 512 since September and it's never had a problem with 5ghz with unifi 6 pro access points. It gets 78 megabytes and change per second if you're close enough to one when downloading from steam.
I've almost only used my Steam Deck with 5ghz wifi and it has worked fine since it came in the mail in July of last year. I only use 2.4 when I'm way out in the yard in the unfenced area to make sure my dogs don't go streaking off after people they know will pet them.
Synonyms of vacillate
: to waver in mind, will, or feeling : hesitate in choice of opinions or courses
: to sway through lack of equilibrium
: FLUCTUATE, OSCILLATE
They make usb to sata adapters and docks, I use one of the former to replace hdds in old consoles and some people's computers with like capacity sata ssds without a computer and a few that are just usb 3 to sata with a 1 meter extension cable and these work great for testing disks with laptops...
External drives are misery incarnate, the answer for small computers is a server with 8 or more 3.5" slots. Before I got s free 42u rack and put a couple of 2u disk heavy servers in it I used a cooler master haf 932 with some old parts, 13 12TB disks with a 5 1/4" bay to multiple 3.5" bays adapters.