Standard Notes is in the same position as Simplenote was 10 years ago. Automattic acquired Simplenote but never really did anything with it. Standard Notes was acquired by Proton last year and development has slowed to bug fixes only. I would be wary to migrate to Standard Notes.
I got 28 online right now according to my Eero. 3 people, with smartphones and laptops. Several game consoles, a few Apple TVs and music streaming devices, Ring camera, Zwave Hub, printer, washing machine, garage opener, Ring doorbell and an assortment of Echo dots.
I used to live in NJ and they sent these types of alerts all the time. AMBER alerts in the middle of the night, "Flash Flood" alerts after two drops of rain. It made no sense and I turned them all of off.
I live in IL now and I turned them back on because tornados are actually a thing here but also I haven't received any other irrelevant alert.
I had a robin nest in my backyard close to my French doors. Every day one of them would pass by the doors, see their reflection and then attack it. Apparently they like to keep out competitors when they're nesting. They would at it for hours until I obscured the lower half with some potted plants.
The Dell wyse 5070 idles close to 3-5 watts. A bit more than the pi, but pretty close. It's older now, can be picked up cheaper than a pi off eBay. DDR 4, sata m.2, on board emmc flash. M.2 a-key for WiFi. Max 16GB ram.
When you throw in m.2, lots of ram, all that IO eats power. So the minimum idle power creeps up. Arm boards too.
3 devices? I usually have 4 devices. I bring my Iphone 13 Mini, iPad Mini, Macbook 12-inch and Steamdeck (and before the Switch). The iPad is for content consumption. I can watch 8 hours of TV on it without breaking a sweat about battery life. The laptop is to work and the phone is to communicate. Steamdeck is just for play.
I do try to buy the lightest and smallest version of every device. The steamdeck is honestly the most unwieldly device I carry around. Everything else fits without a problem in my messenger bag.