Energy Removal and Super Energy Removal were incredibly important to how the early game developed. Yes if we were to remove the raw draw, search, and even Trainer recycling power of the early Pokémon TCG, they probably wouldn't be... but those first two are pretty much mainstays of how Pokémon differentiates itself from many other TCGs, for better or worse.
As an experiment I began testing with a card pool consisting of Base Set through Fossil. I was trying to get a group of other players interested as well but it all fell apart before it even got started. So it was just me testing on my own. Still these incomplete, preliminary results suggested that if you got rid of S/ER from the early card pool, you got a much healthier and more diverse metagame. It turns out that Haymaker decks needed to keep the opponent from building anything remotely "big". Kind of obvious, but really think about it; Haymaker decks worked because of both OHKOing really small targets while its own Pokémon took multiple turns to take down. Without S/ER, even in the face of Gust of Wind, you could build stuff up to rival Haymaker Pokémon.
You might be down two Prizes and at least one, but without S/ER several decks could afford Electrode (Base Set) as a 2-2 (or more) line. This meant you could use its "Buzzap" Pokémon Power so that Electrode would self-KO but turn into two Energy of any Type. Throw in your manual Energy attachment (often on a Double Colorless Energy) and most of the card pool (Evolution or Basic) can be readied in two turns of prep. So even if the Haymaker deck does its thing and KOs one of your Evolving Basics, as long as you opened with two of your main attacker (or its Basic Stage) and two Voltorb, it was okay. Next turn you would Evolve, pull off the combo, and have something Haymaker decks would struggle to take down.
Haymaker still remained one of top decks, probably even the best, but the other competitive decks of the time joined it as the top tier. The decks that were functional but non-competitive suddenly became the new Tier 2 and Tier 3.