Generating focus via damage being limited to only base weapon moveset attacks as a 2-handed melee player is tough with their slower speed. Oftentimes I won’t be able to get more than 1 attack off of a boss per the majority of their openings, and if the boss is anything like phase 2 caretaker, then no way am I going to be getting any focus via parries anytime soon(could be a skill issue, as I haven’t figured which of his phase 2 attacks are and are not parryable).
This leaves meals and channel as the primary sources of focus generation(beyond focus gems and enhancement system RNG), and we only get 10 of those meals at most per boss fight. As for Channel, without increased focus generation enhancements, having to hold still for a solid 3 seconds, sapping your health to get any amount of usable focus during a bossfight is asking to be dropped on the spot.
If melee players were able to generate focus offensively from stamina-based melee rune attacks, like the magic stamina runes allow for, then this would allow for much better flexibility for slower weapon users to gain focus against enemies with tighter damage windows, especially when the enemy or boss has few parryable attacks.
I agree that it would be a nice baseline rule that if a rune cost stamina to use, it should generate focus. For people who want to mix and match the various kick runes with their moveset combos, it would offset the opportunity cost by at least helping them build those custom combos into a rune attack finisher efficiently, like in fighting games, where even if you have less than enough meter to do a super, you can do a long enough combo to generate it by the time you need to use it.
I don’t see any particular reason to not involve stamina costing runes universally into the meter generation ecosystem, and it’d be a nice plus that they would benefit from focus % generation stats, seeing as they do not benefit from focus cost reduction.
Many of the kick runes are quite nice to either interrupt an enemy because the initial poise damage stops them, or because you can instantly go into an attack out of the recovery of them, making them much safer or useful openers for some weapons due to gap close/range/aoe. You can also do sprint attacks immediately out of them too, letting them operate as really nice variable mixups for a lot of situations.
Anyways, I agree with your suggestion and I don’t see why stamina costing runes for magic alone should be privileged in regard to building focus.