Caring about seat size makes sense, but power outlets - for $30 you can get a good quality battery that will charge a mobile phone multiple times from its capacity, for $100 you can get one that'll fully recharge a laptop once or twice. So unless the price difference for flying is tiny, it's really not worth paying more because a plane has power outlets when you can pay less to get a device that's not only just as good for the one trip but that you can then use on future trips without paying more (except for the tiny cost of electricity to recharge it before the flight).
I thought I didn't care, but I chose Delta instead of Southwest on a flight and not having to think about it at all (did I charge my laptop? my phone? my headphones? it's okay, I have a portable battery, wait, is it charged? did I remember it? can everyone else get up, I left my battery in the carry-on?) makes flying less stressful. Plus, it's one less thing to carry around for a week. Same goes for assigned seats, it's one less worry while being shoved into a tin can and flung into the sky.
Fair enough - I elaborated here [1] on why it's by far the better option for me, but I completely accept that different people have different priorities and different weightings to the pros/cons, so whatever works best for you is great too.
Yes, there are novel solutions to many problems, but an outlet is the most reliable and lowest effort solution. And nearly every plane has them these days, so why overthink it.
For me personally, taking into account whether or not a plane had power outlets is the overthinking option.
I've been on planes / trains / coaches that are expected to have them, but who had faulty outlets at my seat for that particular journey and I wasn't able to use them. So I just have a small battery pack (little bit bigger than a pack of cards), and a big one for laptop recharging, and I take one or both (plus my slightly bigger than a lipstick one that's light and fits easily in pretty much every clothing pocket I own) depending on the trip I'm going on, meaning no added complexity as it's just like remembering to take my laptop's power cable, and I no longer have to spend any time thinking about whether the transport will or won't have a power source for me.
I appreciate what works for me won't be the preferred solution for everyone, but for me it definitely leads to less overthinking per trip not more. (And personally I don't notice the added weight of these batteries in my bag; and I would want them for travelling even if I could be guaranteed every flight & train had working power outlets, as I've had times when they were useful to have when visiting a client's offices, or when staying in a hotel with a dodgy outlet, or when going hiking an nowhere near power outlets - so in my case it wasn't even an additional cost caused by not trusting planes to provide a good power supply.)
