My long Oda campaign on hard is rather slow moving because it gets boring preparing for realm divide. That doesn't mean there are no wars with the mighty clans. Takeda appears to be the biggest threat because they tend to dominate the northern part of the map and it's been an on off war with them. To keep them off my back, I only made one vassal, Kiso, because that front is easy to defend. I avoid making vassals elsewhere because Takeda and dominant southern clans can easily overwhelm them and draw you into unwanted conflicts. Another reason for limiting vassals is to avoid them expanding on their own without control, which can increase your honour to trigger realm divide prematurely. But Kiso's peaceful.
Takeda did attack Kiso, but after repelling them there and inciting some revolts on their Ikko Ikki front which they controlled as well, while they had to fight Saito on the opposite front, they decided to ask for peace and later even an alliance which I accepted (unbelievable after a history of long conflict and hostile relations but true). As I prepare to face realm divide with 13 provinces (less than 17 to buffer any unexpected increase in honour, I am allied to the dominant Mori in the south and mighty Takeda in the north as well as Hojo. With both flanks secure for now, I'm in an ideal position to prepare to march on Kyoto.
I think Takeda, despite its aggressive trait, was more accommodating this time because of my daimyo's honour. I never betrayed any alliances, refused to end wars with clans my allies are fighting and protected my vassal Kiso at all costs. Making peace with Takeda was a betrayal to Kiso though but as my vassal, they have no choice but to accept it, for their good of course.