Realm world download/upload speed & lack of user control

In essence, realms is a great idea, I think it is executed poorly. The lack of control an owner has over his or her realm is extremely disappointing; with almost no file control. The only thing that may be changed is the world file and data packs. Which is at least something to customize but with an extremely dismal upload & download speed, it makes customization of one's world extremely daunting to take the realm down for everyone for up to 30 minutes to an hour, just on Mojang's end. This doesn't even include other issues that plague realms.