Polishing matte paint makes shiny patches, and shiny patches on matte paint do not come back. It has to be coated with a product formulated for matte, or left alone. This is the single most common way a matte bike gets ruined by well-meaning detailing.
Every fill risks a run down the side of the tank, and repeated fuel exposure attacks clear coat over time. A coating gives you a buffer and makes the wipe-off easier - but it is not immunity, and drips still want dealing with immediately rather than at the next wash.
Exhaust headers, engine cases and the panels around them run at temperatures no car panel sees. Those areas need products rated for it, and some of them are better left uncoated than coated with the wrong thing.
Paint, plastic, powder coat, anodising, chrome and raw alloy all within a few centimetres. Each wants a different product, there is nowhere to hide an overspill, and almost all of it has to be done by hand.
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