Mojang/ Microsoft: The pop-up dialog is superfluous, it can't be avoided, and it is not useful for all your users. Most players are smarter and more resourceful than this, and don't need priming with dialogs that amount to being automated spoilers. Veteran players do not need it. Please don't clutter the UI with busy little things like this.
Microsoft can do whatever they do. It is their game. If they get feedback on forums, where people post comments, some of it strong feedback, then possibly they'll allow players who feel passionate about a new UI feature to have the option to turn it off. I don't like the direction this leads, not having control over UI notifications I am seeing. What next? Little advertisement messages I can't control? It is creepy.
I'm guessing from the responses here that there is no way right now to turn this annoying pop-up feature. I'm hoping people at Minecraft read forums and will allow users to turn off forced notifications. Please don't assume pop ups will be universally wanted or helpful -- for a lot of people, these are not needed at all. Screen space in Minecraft is precious, and many users don't want it populated with UI activity beyond their control. Plus you might be doing something dangerous in the game and a pop up suggestion will come up, surprise you, and you will fall to your death or be killed by a mob.