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Why should I not paint it?
Of course, you can paint your rendering. It will be expensive. Because of health and safety regulations, you will need scaffolding and appropriate equipment. And it might be difficult to find an exact colour to match the rest of the building or to match your neighbours. But it will improve the look almost immediately.
HOWEVER, unless you clean and treat the render first, that immediate improvement is all you will see.
It is only a temporary fix.
Through-coloured render is designed to breathe. By simply painting over the top of it, moisture is trapped underneath the paint. Which causes damp. And any organic dirt will eventually eat through the paintwork.
The paint will start to flake and peel. The moss, algae, and lichens will grow back through the surface. And the only thing you can do is have it all professionally, and expensively, removed. Just to start again.
But there is another option.