Maybe coating mfg are tiring of trumpeting `hardness` as a positive attribute and it`s time for them to focus on something else. Hardness, IMO anyway, is waaaay overrated, be it your standard `9H` or the vaunted "Diamond Infused 10H hardness"
As for myself, although I`ve only used Skin as a `dedicated topcoat" with Syncro, I question the `add-on` topcoats as far as longevity goes. The Skin component of Syncro is very entertaining at first but has faded somewhat quickly given the mfg claims of longevity. CarPro quickly came out with V2 of Gliss, my guess after some less than desirable aspects of V1 came to light. Not sure about one of the favorite topcoats, Gtechnic EXO, as I`ve never used it. Now, in the case of Gliss & EXO, it`s easy enough to refresh/re-apply those but in the case of Syncro, Skin is not sold separately so becomes a bit of an issue.
With regards to Kamikaze, while either can be used alone, the `top application` is Myabi x 2 + ISM x 1. Miyabi has a hardness 8-9H (pencil scale) and a water contact angle of only 95 degrees while ISM is described as a "Flexible, Hydrocarbon Ceramic Coating" with a Water contact angle of 105 degrees and hardness rating of 3-4H (pencil scale). Whatever it is, seems to excel in self-cleaning.
Eh, maybe all coatings are `somewhat flexible`; your post reminded me to check on the IGL Quartz I poured into a cap either last week or 2 weeks ago. Although hardened, it`s still flexible...up to a point: IGL QUARTZ -
https://youtu.be/Iqsn5EhemO0
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