Hi there,
a few years old, but I also face similar issues like OP, not having everything on sync.
I understand concerns about performance / data (especially mobile) etc. which some of you already posted.
So I want simply to have EVERYTHING on sncy ALL THE TIME. Simple as that.
Why is this not an option (with a warning "data consuming, beware" or what ever). After all, as an option, it'd be my choice.
I use the app for 4 email accounts, one of them is for my business. Especially for this account I really need such an option. I daily create folders, rearrange emails, make sub folders or flatten some out again. It's organizing my emails. I get new customers, I need new folders, I have different status like "ongoing" and "request" and "done" and so on and on - I have many folders and it will always change.
I have endless data and even if not, it would be no problem to make such a "sync everything" option go along with two options "on mobile" "on wifi".
I don't understand the previous discussions about how much sense such a feature would make etc., if you just could delegate this choice to the user himself ... I for example would be glad to make my own choices on this topic.
Right now I always find myself in the situation "ah damn, where is that email from 2 days ago, I need [to answer that], [the address in there], [...]" only to realize that I don't even see my freshly created folder from last night, as it's not yet synched. And doing the sync of the folders manually is quite unpleasent, again and again... Nothing I would expect from a "pro" app.
So maybe there could be done something about it in the future, I'd be glad!
Greetz!
BAERUS
PS: Maybe all of my problems are already solved in some way, but I can't figure them out yet.