Although Season 2 has been significantly longer than Season 1 (by about 4 months, so far) the sheer amount of extra stuff we have gotten this season, compared to the season 1, has made the wait very much worth it. Engineers, major & ongoing Mission System overhauls (including, but not limited to, better branching missions and now chained missions, as well as missions you can increasingly get away from the mission board), passenger contracts, ship-launched fighters, NPC crew (albeit currently limited to the SLF), Planetary Landings, Avatar Creation, Multi-Crew.....and those are just the ones that come most easily to my mind. I think people do too easily forget what has been achieved this season-maybe because nobody can remember just how "bare-bones" Season 1 really was

.
- - - Updated - - -
I call it "managing expectations", to be honest. Remember how, in January 2016, they gave us what turned out to be a wildly optimistic appraisal of the release dates for the season 2 updates? Then remember the massive outburst from the community when those release dates weren't even close to being met? I don't blame them for not wanting to repeat that experience-hence why they're trying to keep any "promises" extremely low key.
At the end of the day, though, that is merely my theory-as only FDev themselves know what they can and cannot achieve in the space of the next 6-12 months.