coating are not watermark-proof, instead it is with slightly more watermark resistance, once caught with watermark also need to grind/compound/polish and recoat

yup, depending on the waterspot removal type and level of damaged by sundried/airdried acidrain/tapwater.
Waterspot removal generally either strong alkaline type (less likely to remove watermarks/less effective) or micro abrasion which might remove or damage the coating, am I right?

sometimes it rains when you are otw to work and dries under sun in open air car park type, this type is most common watermark causing issue which is hard to avoid