The 2018 Dallas game seemed to create the template on how to stop "late career" Drew Brees. He was having an MVP quality season to that point, but had also noticeably become more conservative with his play. They got really grabby with the receivers within 20 yards and didn't worry about anything downfield, and it suffocated the offense.
The Rams were able to copy that game plan, and take the grabbyness to the next level later that year, and we've seen it in games we've struggled in since. Not every team had the personnel or coaching to do this -- it helped to have a fast linebacking crew that could help defend the underneath passing game (see Tampa in the playoffs last year) -- but in the playoffs you're going to run into these teams more often than in the regular season.