I reached the skill Ultimate Wizardry after already having exhausted all research.  I expected to be granted some mysterious new spell to research of "legendary might" as the skill describes, but nothing whatsoever happened.  I devoted fully ten skills choices to finally unlocking this and nothing whatsoever has occurred. No message, no new spell.

Apart from that extremely frustrating bug a lot of tooltips should be improved and made more precise (that destroy forest wipes out several grid squares completely, turning them into shadowlands, just one example, would be good to know before casting the spell).

One should be able to see the logistics breakdown in the city window.  One should be able to see at a glance the total spell maintenance for enchantments on heroes.

There are many more little things, but one of the most frustrating i your allies penchant to plant themselves on your roads, nullifying their value as you cannot walk through your allies.  In my current game my allies have planted multiple armies all around my capital, blocking the roads completely.  I cannot make new roads without destroying forest and thus my land.  Two possible solutions to this - grant more diplomacy options - allow us to ask them to move their units out of our sovereign territory or much simpler - let our forces move through allied forces (have enemies and those we are still in negotiations with block, but not allies).

Thanks very much.