In Modern, it's been enabled both by Ruby Medallion becoming a legal option for Modern, and a new MTG planeswalker card, Ral, Monsoon Mage - which we saw spiking last week
Now you refer to exile. Its been in every set (in some form) since the start of the game and expect it to remain
Sure, they are all in one convenient bundle of flexibility but the options you lose by it not being at one mana is comparable to the options you gain by having them all from one card
You can cast them more efficiently than other spells of its type, and get to the ability that comes with it faster
Imagine you are playing a standard MTG session with your friend
Hidden Agenda cards are placed face down, and all require you to secretly choose a card name as you place them into the command zone at the start of the game