What is the problem with GrapheneOS?

I've heard before Graphene is toxic. What did they do?

ThinkPad for laptop (user repairability, third party parts, open schematics)

My fully decked out ThinkPad T16 Gen 1 I got for work last year is a piece of shit. Lenovo keeps messing up the BIOS (sometimes it took up to 2 minutes to reach the Windows loading screen), it sometimes has trouble with the Lenovo Monitor (which has a docking station with USB-C), or a colleague who had the same model it refused to charge.

Don't get me started on thermals, that thing either sounds like a jet engine or throttles down to 1.4 GHz on a damn 6 core CPU. That's partly Intel's fault too of course (The AMD counterpart would likely run cooler/faster).

I always thought ThinkPads are awesome, now that I actually use a $3000 one I'd never buy one myself.

I'd say for the oxymeter it depends on what you want it for. If your health depends on it, yes spend more for a good one. If it's just for general interest the cheaper ones will likely be "good enough".

For batteries, generally true. Except the Kirkland non-rechargeable packs are very good batteries and good value too. Not that I often need non-rechargable. Just for those few devices that are not happy with the lower voltage of rechargeable batteries.

Otherwise, definitely a good list. I'd also say in general for electronics, be very wary of Chinese brands you've totally never heard of selling items for less than half the price a reputable brand sells the same thing for. They are generally putting fake CE/FCC labels onto devices that are definitely not certified and will almost certainly be underrated for the requirement in a best case scenario. I am currently especially suspicious of the 100w+ PD supplies that are ridiculously cheap compared to known brands for the same rating.

Maybe the downvotes are because you wrote your post in the opposite route. Of you read OP again, you will see that there is a whole post for that.

Thank you for your quality post anyway!

In general, never go for the cheap option on anything where flaws have the potential to destroy something much more valuable (either more expensive or your health, life,...).