So what mail app are you using for windows ?
Outlook is bundled and synchs with Icloud for windows as does your bookmarks etc etc with IE or edge
I have an Apple email account and have always used it to synch across all my devices. You can still keep and use your Icloud as your primary source

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I do the same with whatsapp other than there is no need to use your phone at all just install WhatsApp on your Windows or MAC laptop. Its actually very nice to use whatsapp on your laptop far more convenient for complex or lengthy chats

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I really do not really subscribe to this ecosystem, sure it's nice its there and other than answering your phone currently where you only get missed calls notifications, the same exists on other systems, Yes we can say Apple make it native and a little easier to implement but none of them are show stoppers
I get it that there are some niche cases eg where the whole family uses FaceTime but this means every member has to have 2k laptops and 1k phones

etc
A lot of hype over very little IMO