For someone who doesn't have a Linux background, "just put it on a Raspberry Pi" is kind of like saying "You write a distributed map reduce function in Erlang". Ie: it's easy if they know it, but if they don't then that "just" is doing a lot of work there.
Pre-installed is almost certainly the way to go for such a person.
This is already a job that requires fairly decent electrical knowledge, especially if there are 3-way switches involved.
Turn-key solutions exist for people that don't want to deal with the complexity.
You have to build the damn thing, which isn’t hard per se since it’s ultimately only 3 actual components, but it still took me some time and felt complicated since it involves attaching a heat sink with thermal compound on a CPU.
And then the software install process isn’t totally amazing either since it involves flashing a USB stick, but also needing to choose a few very non-obvious options.
Should I install HA on the EMMC and later move my data-disk to the nVME drive or install the OS on the nVME drive directly? Google random forums to find out what people think of this decision first I guess.
I mean I think it’s still a good product, don’t get me wrong, but it is still very much a power user thing.
Which is probably fine because setting up HA itself when you have an install isn’t exactly a picnic either.
This is the problem with lots of stuff similar to HA when it tries to break into a non-enthusiast audience: people don't WANT to choose how to install it. Most of the time they have no clue why they would choose one thing over another and giving them those choices is confusing and overwhelming.
It's like starting a an intro to Nix tutorial with by asking if the user wants to enable flakes.
I say this as a very active user of HA & Nix for 5+ years.
I've had HA for +4-5 years too.
It works out of the box, is very easy to source (hell some brick & mortar stores sell them), has very good Linux support due to its popularity, and makes up a large part of the install base meaning HA support for it is unlikely to get deprecated.
I was with you until this point. A Pi hasn't been easy to source for almost 4 years now.
Thus the Linux/RaspberryPi underlying complexity is irrelevant to the user - the "complexity" is to dd/BalenaEtcher/etc a downloaded file to an SD card, put the card in the Pi and connect it to power. From there it's available over the network and can be configured through a web browser.