I've finished every mission except a few on the last chapter (lunatic difficulty). So there's basically no way for me to get orbs anymore except for the very slow 2 a day. Plus the stamina requirements are so high I only can play a map or two every couple of hours. And after a huge number of pulls I have two (low tier) five stars.
Not to complain too much but after being really into this for the past few days I realize there isn't actually anything to do and the stamina system means the game is actively trying to stop you from playing. I wish I had rerolled and got some five star characters I liked.
Ok- complaining done.
Yeah I think the stamina system may need to be tweaked a bit.
We've discussed it earlier in the thread, but other Gachas have a a "sloping" system where you start off with a low stamina maximum (like, 10), but you also have an account level that increases your maximum when your account levels up. So your maximum grows while the stages get more and more stamina intensive. In a system like that, you do have to wait longer for a full recharge, but when you open the game up to play you can usually do a decent amount of stuff before running out.
FE:H, on the other hand, starts you off with 50 (comparatively high for starting out considering missions begin at like 1-3 stamina cost for the first while), but 50 is where it stays. That means when missions start costing more there's nothing to mitigate that.
For your other points I'm hoping for some decent content drops in the future. I think their planned schedule was every two weeks?