History shows the market does better under a Democratic administration. Probably for your reason of predictability.
One thing is certain, nothing is predictable with Trump, except chaos. And because he lies about EVERYTHING, his 'word' is worthless...
He was supposed to be the great deal maker, what a joke.
His 'policies' are a sugar high, all carbs, no protein.
He throws out an idea, without doing his homework.
Remember, he made money selling his 'brand', that can only get you so far.