I don't think I've ever used empower on an ability, only on refilling ability uses.
Same, and that really tells you something about the system. If lethality was as high as in PoE1, there are many instances where a big effect NOW would matter. However due to the more grindy nature, "hard" fights typically mean longer fights, which means casting all your spells twice is hilariously more efficient than x1.5 effect or whatever to a single spell.
In TCG terms, card advantage > tempo in Deadfire.
There's still a lot of great encounters, but the lack of lethality (on the opposition's side, obviously) is my biggest problem with the difficulty. Beast of Winter is the extreme example, but most fights post Level 12 have followed this blueprint, more or less. There were early fights that did not - beating Cave Grub fight underleveled meant having to empower a Puppet Master, for instance, because the encounter actually was an immediate threat if I didn't manage it right away.