[IAmNotAJerk]

I am complete new to the community and have zero knowledge about programming. But I was wondering why cross devices ebook annotations syncing would be so difficult.
I know we can have various ways to fetch or export annotations into txt files, but I think what most people wants is to have these annotations shown at the right place when they open up ebook files in different devices: highlighted text at the place where it suppose to be highlighted when opening epubs.
I know an annotation plugin for Calibre is in progress and I really appreciate it. I was wondering will there be chances for me to syncing annotations and have them highlighted when i use the epub reader in calibre? Amazons and other ebook corporations have various annotations format, will converting these annotations format across different corporation be difficult? And, can I turn the exported txt annotation files from various devices into highlighted annotations shown in calibre's epub reader?
I often feel really frustrated, worrying if I will be stuck with the same ebook provider after i spend so many time reading and annotating my ebook.
Not a native English speaker, so sorry for my poor English.