I think we are just feeling the 'Nomad' SEGA effect years later and what your really calling 'lack of perception' = lack of in house Japanese games. But even then, no one purchases said games and SEGA has been badly marketing them. SEGA gave Rhythm Thief a chance (a in-house rhythm game) before the whole Miku thing and it failed. Miku did good. The list goes on. My only point is that if people bought good games, they would continue to do said games.
As for what you think 'SEGA' is, that is subjective. Why is Football Manager less of a SEGA game than, lets say, NFL 2K? SEGA always did western aimed titles.... always. You aren't mad that they are still doing it, your mad that people actually buy those Western titles and ignore Japanese titles.
This is a problem that the whole Japanese industry is facing, including Capcom, Konami and such. They all cut their mainland franchises and are aiming at more 'western style games'. Do you think Dark Souls looks Japanese in style? Dragon's Dogma? Dead Rising? Even Resident Evil turned into more of a 3rd person action shooter co-op game (that was really popular thanks to Gears of War).
Do I wish SEGA could release new Japanese in-house ips in the West that rival Jet Set Radio, Rez, and the such? Of course, but it won't happen because no one purchases said games.
In the end its about sales. Why would Creative Assembly want to work on a Altered Beast game (come on, that game wasn't even good) when it will come with restrictions (gotta be true to the IP) and fan whining? Why not just continue doing their Total War games that sell 2+ million guaranteed or do a new IP? Why does it have to be a old IP? When did SEGA dip into IPs so much?