Against the heavy Wasteland decks, it hurts some, but you still have 23 mana sources. RUG is still rough because of Stifle + Wasteland.
I'm still happy with it because I was finding in most matchups I was playing, I was boarding out a land quite a bit (per Akatsuki's sideboarding guide) so I basically decided to just play 19 lands to preboard against those decks. The maindeck Sylvan I can play because of it can usually find you plenty of lands if you need it too.
Basically, against any deck that aggressively attacks your manabase, you want the 20 lands, but against anything that doesn't molest your manabase, 19 lands is fine.
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