Because DEEN is notorious for below average animation and bad adaptations lately. Some examples of recent series:
Original Fate/Stay Night
Log Horizon 2
Pupa

They are no longer what they once were, rarely getting any series made. There time is pretty much up compared to some of their works at the time being considered amazing, however now most of their work are considered average at best.

Similar to Studio Peirrot which also lost their prime. Their most recent series Tokyo Ghoul was pretty bad adaptation with the root A just being complete bad.

Right now the studios in their prime I would say are Madhouse and P.A. works, excluding A-1 picture, Feel, Silver Link, J-C Staff, an Bones, who are inconsistent with their work. And KyoAni for always being KyoAni.

Madhouse has exploded with Hunter x Hunter, Parasyte, Death Parade, Ore Monogatari, Overlord and One Punch Man coming this fall.

P.A. Works has became popular with NagiAsu, ShiroBako and Charlotte, with RDG and Glasslip being misses.