It is cause while gaming you can set it to low and if you have a beast and the UI is still struggling cause of the game then my opinion is that Seelen Is using less resources to maintain itself but I think it should be controlled by the user on how much the UI should take , so it will have this advantage:
• UI will feel like it working flawlessly if the user allocated more resources
• gameing can be much preferable on low end devices ( even if seelen UI is optimized) with the UI on
• no random stutter on UI except when the resource allocations is less