Tanking isn't "prioritizing" long term success. NE "prioritized" long term success when they traded Logan Mankins for draft picks.
Tanking is intentionally sacrificing short term success to move up in the draft via having a worse record. If you are purposefully trying to improve your own position in the draft, you are tanking. Period.
Miami will probably win four to five games this season. Let's magically back up and erase all of the trades, bring back Stills, Tunsil, etc. How many wins are those players worth, together, all told? One? Two?
At best, in the prettiest Normal Rockwell painting with the sun shining bright, this was a six to seven win team.
Miami got rid of players, obtained draft picks and gained flexibility in the cap all while sacrificing maybe a win, or two; I'm not sure if they would even accomplish that. They gave up 163 points in the first four games, those would have been a wash no matter what. Kenny Stills ain't helping. I like Mink, he isn't stopping those flood gates. Those ass kickings are happening whether the trades do or not.
Maybe Miami gets their first win against the 'Skins. They got smoked in Buffalo. They got smoked again in Pittsburgh.
Coming up - would they have beaten anyone else on the schedule besides the two they probably will beat (Jets and Bengals) and the one they may beat (Browns) to get to five wins?
This team did not / isn't tanking. Tanking is losing on purpose. They could not have done any better this season either way.
And, for the record, the Minkah trade was horrific.