Historically imposing or not, I have to disagree with you. As more and more issues become settled, the length of time between councils should become greater and greater. A council should only be called for a grave and compelling reason (like the Protestant heresy that ravaged Europe and brought on Trent). I have to staunchly disagree with your idea that we should just call a council every 100 years or so. And that's the thing about Vatican II, there really was no impetus for it. It was unnecessary.
Perhaps. That makes sense too. I mean, what came out of it was certainly unnecessary repetition (in lots of fluffed up words) or else ambiguity.
But I think SOMETHING was certainly necessary, the modern world was facing (and still faces) a collapse of faith and reason greater than any mere Protestantism. There was certainly a HUGE crisis. Two world wars had reshaped the cultural landscape entirely since the last council (whose crisis was mainly the loss of the papal states), communism loomed (but I think we now know that was merely a distraction from deeper issues in our own culture), and we see the results of totally novel secular culture today. But what the council produced totally didn't address any of that. It just sort of talked a lot and said very little that we didn't already know, but used a new feel-good tone of voice.
It was cowardice really. They chose to try to make the Church "relevant" so maybe it could survive a few more years in the new culture totally foreign to christendom. They should have trusted in Christ's promise and stood boldly by tradition with, yes, harsh language even. "Well, if we don't give a nod to tolerance and democracy and lay participation...we'll look foolish and irrelevant". Fine. Then be fools for Christ. But backing down only made people LOSE respect.
Nevertheless, I do think they compare themselves (wrongly) to the greatness of Trent...and that is setting the bar a little high...and while Vatican I fortunately turned out well...I think they sort of choked under the pressure at Vatican II. Things became very bureaucratic since Trent. And if the US government is any model, bureaucracies don't like to admit mistakes...they'll stand behind failed programs and pass the buck forever...insisting it will work if a few more things are just adjusted...not really caring about quality while their jobs are cushy...