It seems this is a very opinionated topic. I bufer my water because of the fish I keep in it (Discus), and because the lower pH really does seem to increase the beauty of everything in the tank. I have kept live plants in my fish tanks for years, with out the right lighting and with out buffering. Everything was fine. But, now that I have started to buffer, OMG!!!! I think the difference is so worth it. My pH is at a 6.6, and the way that I get it is by filtering RO water over peat. I will include a few links.
It does take extra space this way, to prep the water, but it is safer than using chemicals, and more stable. All this for a 30 gallon. IMO, go for it!!!