MLS is mutually exclusive with trying to win every year, even if you define "winning" as just making the playoffs.
Even with 7-9 teams getting in from each conference, RB has the only double digit playoff streak at 14. The next longest is Philadelphia at 6, then Nashville and Orlando at 4. One thing these teams have in common is never winning MLS Cup. RSL has the only 3 year streak. They last won the Cup in 2009.
Every single one of the remaining 24 teams: the Crew, Sounders, Portland, LAFC, Atlanta, everyone, has an active streak of 2 or fewer.
The NYCFC streak of 7 consecutive appearances is tied for 6th best all-time. Four of the five teams with a longer streak were founding members in 1996. The other is Seattle who began MLS play in 2009. The 2 teams tied with streaks of 7 entered in 2005 (Dallas) and 2009 (RSL).
Excluding teams who haven't been in the league 5 years, only RB, Seattle, and LAFC have made the playoffs a higher percentage than NYCFC. LAFC had the advantage of joining the league when it was possible to make the playoffs in Year 1.
Excluding teams who haven't been in the league 5 years, only Seattle has a playoff streak that is longer relative to its time in the league.
We're very spoiled. If we don't make the playoffs this year, that's maybe sliding to mediocrity. As of now, arguably nobody but Seattle has had it better than us.