Are they unimpressive because they aren't super fast or because they just aren't that high quality? Pedro and David Villa were damn good winger/forwards and they weren't super fast. Also Cristian Tello back in the day was very very fast and he amounted to being a La Liga journeyman. It's about quality
15 years ago
Spanish football also dominated 15 years ago
TikiTaka was unbeatable
Maradona was unstoppable 35 years ago
CAM was the most player in 352 in the 90s and early 00s
Sweeper was a big thing 50 years ago
Goalkeepers didn't need good passing 20 years ago
Things change
Football (outside of Barca's world) is moving into athletic-cyborg territory like NBA and American sports. With skills as a cherry on top of athleticism.
Without athleticism, players will usually watch football only from the tv in 10-20 years.