Why not an Xtar PB2S then? - a powerbank without fixed batteries.
You can carry extra batteries in it and use it as a power bank, with much faster charging input and output than any flashlight power bank. You can charge your phone with the PB2S, leaving the flashlight free to be used. It’s very little extra weight over carrying spare batteries in a case.
Or the Nitecore LC10? It’s basically the weight of a charging cable, and also has a power bank function (and a little flashlight) and will charge the 14500s for your TS10 as well as 18650/21700s etc…
Your use case makes sense, and if it works for you that’s good. I’m not as opposed to integrated charging as I am poorly designed rubber flaps, really. I know there are scenarios where it makes sense or is just convenient. That’s fine.
Still, I personally don’t see why the charger/power bank needs to be on the flashlight itself. When they’re separated, you get a more robust, lighter weight flashlight and a much better charger/powerbank.
I hike a lot too, and while I’m not an extreme ultralight hiker (where I can see the potential benefit), to me a couple extra grams in my bag is much more manageable than carrying those extra grams in my pocket. And outside of an ultralight backpacking scenario, I don’t see why I should have to carry around a charger and powerbank in situations where I don’t need to, like most EDC use.
I dont think it needs to be a ubiquitous feature. I don’t think it’s functionality that everyone, always needs to carry on them, all the time, every time they carry a flashlight, yet, you can hardly find a brand that hasn’t moved to integrated charging in most of their new models. At the very least I don’t think integrating charging needs to be in every new light, but manufacturers seem to disagree.
Semi-side-note: I wish phones still had user swappable batteries. That would solve a lot of these issues. I remember being able to carry a spare battery with me for my samsung Note 2 and never having to worry about charging or powerbanks. The only reason I now need a powerbank is because I can’t just swap out a fresh battery into my phone.