"The game can't do that..." is because people often make a suggestion with no regard to how it's engineered. This is the same kind of reasoning that goes into both the chat system and the number of characters in a zone. There is no reason the client can not do X * characters or X * channels, other than that is what the engineering was designed around. If there are somehow 128 active players in all 8 link shells plus the FC, and Mentor (which has a global limit) channels, you have you have 1.4MB/sec (11mbits) of bandwidth being taken up, just with chat spam. Realistically, there's never really more than 10% of a LS people talking at once, so it's more like 133K or about 1mbit, but that's still 1mbit multiplied by all online players in those LS's. But it doesn't matter if they're saying "hi" or writing a small novel, netcode processing is netcode processing. That's just where SE decided to place a limit so that gameplay would not be impaired.
Text Chat is one of the oldest things computers have been doing since before the internet, and there really has not been any improvement in text chat since IRC's "chanserv" bots to enforce server administration rules. Twitch, Skype, Slack and Discord all operate the same way as well. You can join a channel and it consumes a small amount of bandwidth to maintain state, but if you have joined several noisy channels, your connectivity suffers, and if the channel is big enough to flood your connection you will never stay connected to it.
The limits are arbitrary yes, but you have to put a limit somewhere. If the limit was 16 channels, people would complain why they can't join 20, and so forth. Most players will never need more than two.
Likewise, this is not a first-person perspective game, the "first person view" you are seeing is just the camera moved to distance 0. However other players still see you, and if you are looking in any angle that the animation wasn't designed to have, it doesn't let you do it. I mention hair clipping because that is pretty much why you can't move your head in any arbitrary angle and the game instead moves your character's body, and why your head only tilts up and down for looking at characters different heights.
Some people on the forum just want to fight other players because they see the forum as a direct line of feedback to SE, and thus they will quickly become hostile to any QoL suggestions that are not thought out and cribbed from some other game.
One of the often repeated QoL things I don't agree with is "instanced housing", because players who bring it up are always complaining about not having a house, and thus being unable to do housing things, yet the apartments (which are instanced housing) and the inn rooms exist, and so does joining a FC and having a room in those houses.
We can not have any serious QoL conversations on the forum because several forum posters don't read the post, let alone the thread, and respond with snark and sarcasm to everyone, thus giving the entire forum the feeling that nobody is welcome here.
If players seriously want SE to listen, the attitude of the forum needs to change.