This is more of a reason to bet it rather than to fade it. The NBA playoffs should theoretically be impossible to cap successfully because there are more constants like you say and thus more stability. As a result if your a book you should be able to make much tighter lines. I would think that the NBA playoffs on sites like
pinnacle or 5Dimes would have some of the most unbeatable lines of all sports for that year.
One spot where lines can be a bit more swingy is a time like now, like if your a book what line is more difficult to create; one where 2 teams are at full strength off reasonable rest and playing as hard as they can; or one where one or two of the best players are sitting, the team has little to play for, coming off end of season back to backs etc
In the playoffs its pretty much impossible to get an edge on a book so why would that make NBA betting easier?