I need to spend a couple weeks just reading on the different branches of techniques again. I've basically stop reading the manga and anime after the whole Path one-eyed Madara arc I'm just completely behind on everything. What does this have to do with Fuinjutsu? Nothing, I'm sorry.
As far as technique branch relationships go, senjutsu beating truth seeking ball stuff and the canon ability to synchronize space-time ninjutsu is about all you missed if you were fluent up to that point. Fuinjutsu and most other SL-applicable technique types did not change at all from there to the end of the main series.
Oh, well, the Tensaigan happened in Naruto the Last. I think that's about it though.
It's ... heavily speculated. Kishimoto never opened the flood gates on the exact specifications of sealing techniques/what rules they must follow.
We can go back and forth, but ultimately must decide for ourselves as roleplayers and as a community if a person's sealing technique is fair/doable without restricting creativity unnecessary.
My questions have been aimed at finding out what is the general consensus on all of this stuff here on SL. The canon is fairly unhelpful otherwise in determining the end of the original premise of fuinjutsu cancelling fuinjutsu cancelling fuinjutsu into infinity.