Some things ought to be more common, and others rarer, but remember this is the future, so ‘high-tech’ is relative.
The world hasn’t been ended for all that long, and you already have to do a good deal of scavenging, universally decreasing loot drops would make the game more tedious, rather than more fun.
I definitely agree that a bunch of the future-tech is a bit too common, though.
When it comes to things with charges, that should probably wait until we have containers or a better inventory system, because otherwise you’ll be carrying around a dozen lighters with different charges that no longer stack, cluttering up your inventory and taking up extra keys.