Investigate may look simple at first, but as you've seen today, it has a lot more depth to it once you start digging into the rules, the synergies, and all the different ways Magic has used it over the years
The standout strength is reliable mana generation through combat
The most obvious and frequently used argument for playing the minimum number of cards is simple: some cards are better than others, some cards will be your best cards, and you dont want to reduce the frequency with which you draw those cards
Don't worry, though, there are still plenty of glimmers from Disney movies to check out
It ramps you, fixes your mana, provides a free artifact for its own metalcraft count, and any other effects in your deck that care about having a number of artifacts in play
I am always seeking images of misprints not listed here and I strive to keep the information as accurate as I can