I know Zoia likes to write new reviews for all her plants every year. I tip my cap to her. Personally, I find I don't have enough to say for a new review every year, but I might if I waited a few years.
I don't mind if Becky doesn't give me an acorn for an update, so I will sometimes edit an older review to say something like, "Edit: This year, Plant X rebloomed for the first time" or "This year, Plant Y showed some rust for the first time" or to add a few more pictures.