it takes a talent to show tsukiyama incident, one of the most interesting and mysterious moments in ieyasu's story,…
I fully agree with you, but to be fair, has this has ever not been the case for taiga drama? More recent ones probably take it a bit too far, but even going as far back as Takeda Shingen 1988, Dokuganryū Masamune 1987 or the first Tokugawa Ieyasu taiga itself from 1983, the scriptwriters always pulled all sort of stunts to twist history and make the protagonists appear morally irreprehensible by modern standards. The only taiga I've watched which didn't try to modernize the main characters like that is Aoi Tokugawa Sandai (and even there they've kinda used Toshiyuki Nishida's Hidetada to counterbalance Masahiko Tsugawa's Ieyasu).
More recent ones probably take it a bit too far, but even going as far back as Takeda Shingen 1988, Dokuganryū Masamune 1987 or the first Tokugawa Ieyasu taiga itself from 1983, the scriptwriters always pulled all sort of stunts to twist history and make the protagonists appear morally irreprehensible by modern standards.
The only taiga I've watched which didn't try to modernize the main characters like that is Aoi Tokugawa Sandai (and even there they've kinda used Toshiyuki Nishida's Hidetada to counterbalance Masahiko Tsugawa's Ieyasu).