Gmail's search function has degraded to garbage now, can't even find emails I type the exact subject in word for word. Go with fastmail, protonmail or really anyone else at this point.
I always found it unbelievable that Google, a company whose entire brand was built around search, built such a poorly-functioning search into their own mail product.
I always found this bad, because I can’t control when people title an email or put in the content. People who use really informal and non-descriptive email subjects drive me nuts. “Here you go”, “that thing you were asking about”, “important”… these are terrible email subjects and once they drift away from the top of the inbox they will be gone forever.
Finding a document again was entirely down to search: title, author, date, meta data, full text.
I loved it. I was in a minority. I loved Gmail's search.