I'm not concerned but I go 100% off character level for ASI or feats and when you get the epic boon. Mainly because I hate the idea of my players or myself strategizing to make sure you don't miss a feat. Flat out with exception of Fighter's bonus two and Rogue's bonus two feats are not...
Hex also is being allowed to use a Bonus Action or a Reaction to switch to a new target. Also will most likely have a Hexblade getting something similar with no concentration on their hex for a few times a day but waiting to see what the hex blade might look like when it gets an official...
We have house ruled that the free uses of hunter's mark per day do not require concentration. However, they only have a duration of 10 minutes instead of 1 hour. Then if you want to cast hunter's mark with a spell slot it requires concentration and lasts the normal duration. Pretty much if...
I have feats always go off of character level. So you get a feat at 4th, 8th, 12th, 16th, and an Epic Boon at 19th level. If you play a fighter you get a bonus feat at 6th level Fighter and at 14th level. Regardless of your multiclassing levels and when they happen you can only get the Epic...