I must admit that i changed my mind, after playing a lot of specific maps and becoming a lot better over the past weeks.
While you have common patterns in specific maps you can learn and improve to read and play them more accurate and faster, you can't really learn patterns in converted maps, because there are no

Also, converted maps are often bad for alternating because of "sudden" big dons and kats, leading to bad habits for new players.
So i agree now that we should encourage the use of specific maps over converted maps.
But having "dead" maps without any ranking wouldn't be osu either.
So we should give them some influence but weight them less than specific maps.
edit: I started playing converted at the beginning only because there are really few ranked beginner maps in my opinion and the difficulty is very hard and fast rising for new players even on futsuu (only here in osu, not in TnT).
So if you want specific maps to become more popular among
all groups of players including new players, we should take a closer look on advanced beginner maps connecting beginner maps to the advanced ones, and also take a look on the taiko map-packs, since it's very difficult to find all the taiko specific beginner maps that are not in the 2 packs.