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[APD] what's so bad about surface scum?

I have an open tank and it gets a moderate amount of surface scum,
which goes away after every water change (2x a week).I was just
wondering if there's anything really bad about having it? Besides

i've read that it stops gas exchange but i'm wondering if that's so
bad. My plants are bubbling with oxygen all day so i don't have to
worry about the tank getting enough oxygen, and i would think
retaining the co2 in the tank is a good thing.

One bad thing i thought of is that it would block out some of the
light. That could be bad if reflects too much light away from the
aquarium.. but don't know how much it actually affects it.

Just wondering if i really need to buy the eheim surface skimmer...
thanks for ur help.

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