It's not that they don't get handhelds, it's that handhelds aren't prominent enough.
Handhelds are more optimal in Japan, so there's a larger market, which means more money for developers.
Consoles are more optimal in the west, so there's a larger market, which means more money for developers.
Metacritic Scores for 8th Generation excluding remakes and enhanced versions
Top 10 Console Games (8 west, 2 Japan)
98 Grand Theft Auto IV (US)
97 Grand Theft Auto V (US)
97 Super Mario Galaxy (Japan)
97 Super Mario Galaxy 2 (Japan)
96 BioShock (US)
96 Uncharted 2: Among Thieves (US)
96 Batman: Arkham City (UK)
96 Mass Effect 2 (Canada)
96 The Elder Scrolls V: Skyrim (US)
95 LittleBigPlanet (UK)
Top 10 Handheld Games (8 Japan, 2 west)
93 Grand Theft Auto: Chinatown Wars (US)
91 God of War: Chains of Olympus (US)
91 Mario Kart DS (Japan)
90 Mario & Luigi: Boser's Inside Story (Japan)
90 The Legend of Zelda: Phantom Hourglass (Japan)
90 Advance Wars: Dual Strike (Japan)
89 Castlevania: Dawn of Sorrow (Japan)
89 Lumines (Japan)
89 New Super Mario Bros. (Japan)
89 Metal Gear Solid: Peace Walker (Japan)
"On my business card I am a corporate president. In my mind I am a game developer. But in my heart I am a gamer." - Satoru Iwata
