They're still obsessively clinging to their hotbar design and refusing to explore more functional UI's for a D&D game.

The metamagic options could easily be moved to a separate open/close spellcasting interface (Solasta, Pathfinder, NWN 2....), where spells would also go and save precious space from the hotbar. And also be found intuitively, neatly sorted by levels rather than be randomly scattered on multiple pages of a hotbar between random potions, weapon abilities and whatnot with tiny icons and even smaller page turn buttons.

Why does everything, every little icon, need to be on the main screen by default in a turn based game? There will be more and more icons. High level spellcasters will be an absolute nightmare to play with this UI.