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Useful Info On Dumbing Down Your TCL Roku TV
(support.tcl.com)
This is a most excellent place for technology news and articles.
What's the point of turning everything you're plugging in on first? It looks like you get an input selection screen regardless.
Solely to let the TV's auto configuration and discovery pick it up and customize the inputs automatically. But you're right, it's not actually necessary to power everything on.
It probably lets you hide inputs you're not using.
The TCL TV I use for my PC monitor has a setting to always boot into an input
I do that and never see the smart features, shit I've never even connected it to the Internet
I just use it as a 42 in. 4k monitor
Edit: I should mention that depending on viewing distance the PPI of a monitor can be quite low before it starts having a noticeable degregation on the viewing experience. At my sitting distance of roughly 30in from the monitor a PPI of 105 (basically what a 42in 4k screen has) is fine as even at that distance individual pixels aren't visible. (45in at 4k is where you start being able to resolve them with 20/20 vision (we get about 1 arc minute of res from our eyes which some ugly math tells us that at a viewing distance of 30in we could determine details at about 100ppi (0.01 inches) in size))
Edit 2 For the really curiously nerdy:
Here's a little chart for max screen sizes for various seating distances based on PPI. The numbers are rounded (and start with a rounded number) and all of them have a FOV around 66 degrees.
Personally I wouldn't go for the max size on any of these and I'd go for a bit lower. Cheaper, dead pixels are harder to see, you may change your viewing distance based on comfort, minimizing screen door effect, etc, etc.