The problem with picking maps is that when we released S8's maplist (which is fairly vanilla, and was voted on by team leaders instead of by admins) we had the exact opposite problem - lots of people asking us for the addition of a few custom maps. Most of the maps picked for S9 were some of those that lost by a very small amount of votes in that S8 map pick, plus involvement and suggestions for more custom maps by the community, and now we're getting a similar backlash. Upward was included in the early stages of conversation but was ultimately dropped. Personally I have no idea where the pl_waste idea came from but it won't count towards anything next season anyways.
No matter what gets picked there will always be vocal opposition. While we're still growing and learning we're trying to keep the map pool deep, but very few of these maps are brand new to anyone who's been playing HL since at least S6.