Nah, what is moronic is comparing pass completion percentages of players from different teams, playing in different leagues and fulfilling different roles.
Your argument about being 4th-5th best playmaker at Barca is entirely arbitary as well. Who are the players better than him at playing the final pass in our squad bar Messi? I can only think of Messi and Ansu (arguably) if fit. Depay can also dribble 1v1, averaging 2 dribbles per game. Can shoot with left and right foot. Lack of pace is a concern but he won't be as useless at running at defense as Griezmann is.
Let's just wait until the man plays his first 5-10 games here. I think he will be reasonably good.
I have already explained this when another user said the same. The pass completion thing is in relation to his assists, that are brought up as evidence of how great a passer he is.
Any player playing the Messi role will get a few assists. Accepting 70% demands some end product. His succes rate is about the same with his shots and dribbles btw, attempts a lot and fails mostly.
I don't think any team can afford two players playing like that (Messi succeeds much more), and Barcelona have Dembele as well...
All Barcelona midfielders are better passers, although not looking for the final ball as often. I'm sure Busquets in these last few weeks has played more and better passes than Depay did in his carreer.
Pedri is better than Depay, Coutinho too. Tell these players that they can play with a fail rate of 70% and they'll create much more, but their team would be worse for it.
Barcelona are especially tender for these players attempting a lot, as they should be offensively balanced, and are pretty slow in defence.