...because I wanted to test out a deck with Root Maze and Back to Basics because that seems fun? (And EGrass/Tabernacle)

It's not like you can swich decks/builds because you suddenly get to play against a matchup where your new tech doesn't do anything.
Like I wrote they were just some preboard games, so I didn't get to board out the Root Mazes for something more optimal like City of Solitude