I'm a sucker for life gain, so a cheaper Boon ReflectionBoon Reflection of course piqued my interest
Regardless, I dont know that now is the time for more than 60 cards, but I do know that as the card pool expands, it gets easier and easier to find more spells of a similar power level, but no other lands are close to the power level of fetchlands, so the incentives to build to maximize the power of our lands over the power of our spells do increase in some way over time, which is to say that, even if its not right now, it could be someday, and getting there first might be the best way to truly break Modern.
But it also found a far more efficient way to cheat Agent of Treachery onto the battlefield with Lukka, Coppercoat Outcast
which the deck is sure to be stacked with
Its a drawback that needs to be considered when playing this mechanic
Its about as basic as this effect gets, but the opportunity cost is so low