[Q] Spare Parts effect on already-full-screen apps?

[pawces]

Hi. I recently installed the spare parts app and did the tweak to get all my apps in full screen. While it worked for most, some didn't go to full screen and stayed the same, thats fine. My question is, how does the compatibility mode trick affect apps that are already full screen on the tab to begin with (like NOVA which i already had full-screen)? Will it degrade the clarity of those apps in any way?