You obviously don't play a good support if you think this.
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I laugh every time I hear this. Because when you compare support to any other roles, they have the **least ** to worry about.
- They don't have to fight for every last cs
This is literally one of their primary objectives. They exist to make sure the adc gets all the cs possible. This entails keeping track of your minions and theirs to know when to pressure, tracking the jungler, and warding. As well as keeping track of enemy cooldowns.
- They don't have scan the map because that's not their job
This is literally everyones job. Every single person on the map should be doing this. Wards are useless if you don't.
- They don't have to make decisions in team fights when they're standing behind the ADC or tank.
This is...just wrong. Some supports shouldn't even be behind their adc (Braum). They have to make roughly the same amount of decisions.
- They're allowed to die a lot because most supports don't get kills anyways
They're not "allowed" to die a lot. It still gives the enemy gold. Yes, it is less impactful to the team overall if you die rather than your adc, but it still effects the game a lot. If you're feeding as a support it still hurts a lot.
- Their only job is keeping everyone alive, something that's quite frankly (despite what people say), not hard to do.
That would go back to decsions you claim they don't have to make. Your teams Galio is low in the middle of 3 of them, and your adc is dying to zed a little over to the right. You can only save one with your ultimate as Lulu. What do you do? What has the most impact? Keeping everyone alive in teamfights with limited tools is tough. That also assumes you're that kind of support, and not something like Brand.