Ethernet speeds on most Pis are fairly unremarkable - those with gig lan ports can't drive them to full capacity.
Yup it can be useful, although it does not meet the ethernet specs - so you will be more limited in cable length.
I have used slim cables made by rhino, under 1/10th of an inch, useful to feed an ethernet, rj11 and wallwart cable through a braided sleeve to a deskphone ...
Be aware that attenuation with length will be much higher: you might get issues over 10m.
Sure, they only sell them up to 3m
The rPi4 and rPi5 do have full gig, I use an rPi4 for NAS. The real life speed on my LAN is something like 900 Mb/s. This translates directly to disk transfer speeds.
There was model rPi3b+ which had a gigabit nic, but could only drive it at about 200 Mb/s, something about being connected via USB2. A normal rPi3b was 100 Mb/s.
I'm not quite sure what you mean by this. I do have control.
I was talking about WiFi for a home LAN. The signals are weak, stopped by a few walls. I get very little interference from neighbours, maybe it is different in a flat?, but I thought WiFi 6 was designed to address those concerns. Not having congestion problems in the first place, I'm happy with WiFi 5.
I'm not sure what else is beyond my control?
+1.
Pis are being uprated according to what people want. NAS is one large niche and gigabit ethernet and fast disk interfaces are what's wanted.
Yes, Wifi 6 is designed to cope with congested airspace better than previous versions.
Weather, and humidity - will effect range and performance.
What kit is installed by surrounding neighbours - you need to share spectrum with them.
Wifi interference installed by neighbours - their dodgy microwave will hit performance on your network.
Can you prevent your WLAN signal spilling out of your property? Or stop someone cloning the SSID, and setting up a duplicate network to capture the credentials of a device that thinks it is connecting to your network? i.e. WLAN has security implications that wired networks don't. Even if an attacker can't connect or snoop on it directly, the meta data contained in analysis of the traffic patterns may disclose useful information.
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