Coralline algae, pros and cons??

So this may sound stupid but lets her your opinion. Is coralline algae always a good thing? Let's just really narrow this to where we have a choice about it. Places like the glass, overflows, even outside of PH. Since you can not remove it from rocks they do not matter. Does having the whole back wall of glass covered in coralline help or hurt? I have gone through phases over the years of letting it cover solid to scraping it off. Currently my tank is just getting covered up on the back again. It's the phase where it starts going from purple dots connecting together to when it starts to plate up and get thick. Thinking that this has to use a fare amount of calcium and other elements in the water. Especially in a bigger tank, mine is 6 foot wide by 28 inchs tall so that is alot of algae. Would keeping the glass and overflows scraped clean leave more elements in the water for corals? Does scraping existing coralline off kill it and create more bioload or will it just reseed in the rocks? Does it leach anything back into the tank after it gets scraped off and is mixed in the sand bed?

Understand that on the normal coralline is a sign of good health and a established tank. But any science behind how much extra it takes from the water? Especially after its been there a few years and starts to get thick. Would hate to be dosing just to have it feed algae.