There isn't a problem in baseball that can't be solved in the Spring.
Obviously this isn't a literal statement but a figurative one, based in the constant stream of stories that come out now featuring Player X identifying the underlying issue that held him back in the previous year and how he's now doing exactly what he needs to do to address it. The most common, now almost laughable, version of this story is the one about the player who had an off-year now showing up "in the best shape of his life" but that's only one type. There is a version for every type of malady and as sabrmetrics ingrains itself more and more into the major league culture it was only a matter of time before something like "launch angle correction" showed up.
Last year some people noted that even though Ryan Zimmerman was doing poorly, he was hitting the ball hard. They took that to mean that a revival was just around the corner. Some of us more steeped in the fancy stats noted that while Zimmerman was hitting the ball hard* he was simply driving it into the ground. The difference between a 80 MPH ball hit 10 feet and a 110 MPH ball hit 10 feet is just how much you get thrown out by.
Well Zimm has found out this same information and is working on hitting the ball higher. But as Boz notes it's not a given. It is difficult to change your approach without messing something else up. Try to hit the ball up and maybe you end up popping up a ton or just missing the ball entirely. Maybe you can hit the ball at the angle you want but to do it you have to adjust your swing just a bit so now your exit velocity drops. The balls that were supposed to be home runs are now lazy fly balls, the doubles to the gaps singles dropping in infront of outfielders. To add to the issue Zimm also wants to be more aggressive thinking that there has been such a change in pitching that he's no longer able to take advantage of a pitcher by working deep into counts and looking for mistakes.
Has he been doing that? Let's tackle the question in two parts - has he been overly patient? Boz seems to think so but I'm not so sure. The numbers are out there but not already calculated for us so in lieu of looking at the whole league** I went ahead and compared the number of 2-strikes ABs to the number of 0 strike at bats (Boz's stat) for the Nats Top 10 hitters last year. The result? Zimm was patient but not appreciably more than Rendon. He was also in the neighborhood of Espy, Bryce and Revere. Murphy and Ramos stood in stark contract as aggressive hitters but on the flip side Werth stood out as ridiculously more patient than Zimm. Looking at 2015 and 2014 seems to say the same thing - patient but not crazily so, not like Werth.
Ok he's kind of patient. Is he hitting well with two strikes? Well no. No one hits well with two strikes. BUT he was during his peak (2009-2012) one of the better two-strike hitters in the league. So there's that. Of course it's been a long time since 2012 and Zimm has been terrible with two-strikes since then even though as a hitter he didn't even go below average overall until last year. Perhaps the game did change that quickly? Doubtful. People hit terribly with two strikes in 2009-2012, pretty much just as bad as in 2013-2016. So while the game may be shifting, it's a slow shift and Zimm's two-strike issues were immediate. So I do think being aggressive may help. He may be passing up some decent pitches looking for a great one and leaving himself open to get blown out but I think he's not going to hit those decent pitches all that well.
Daniel Murphy may have been able to figure out how to hit better, but Daniel Murphy is a different type of hitter than Zimm. Murphy always hit for higher average and always wanted to hit the ball. He put the ball in play constantly, keeping walks and strike outs down. He did this not by swinging a lot but by making contact when he chose to swing. This does not describe Zimm.
I suppose it is worth a shot. Zimm had a terrible year last year and it's hard to throw up your hands at something like that and say "well hope it changes this year". At the same time any one who's even swung a bat in Little League can tell you that once you start changing things it can just as easily make things worse as opposed to better. If Zimm gets any worse he's unplayable.
*perhaps - statcast still isn't perfect or complete in its gatherings - but it's close enough though for comparative purposes
** Swing percentage probably is a decent proxy. In that Ryan would be about 40th lowest out of 147 qualifiers if he had qualified. Low - indicating patience, but not crazy low. Werth, who I've noted is a very patient hitter, would be 6th lowest for example.