>>42345293> 6 Routes of fuck all5 Routes and even so 4 of them are as good if not better than the best Routes in Galar. Routes 11, 13, 14 and 15 all reward the player with a Route that encourages exploration, making use of Dark Grass and Item Placement as well as giving the player additional trainers to reach through exploration.
This is also ignoring the fact that these Routes make up a large bulk of the new Pokemon you can encounter in the Post-Game (unless you're playing White for obvious reasons).
Also getting back to your argument, you're neglecting the two post-game dungeons Giant Chasm & Challenger's Cave, as well as the post-game plot of hunting down the Sages which gives you an additional mini-dungeon in the Relic Castle Lower Floors and even acts as an incentive for the player to explore the new Routes since one of the Sages is located on Route 14.
BW certainly could've had more post-game content to give the player however these additional routes, the exploration that they offer, new Pokemon as well as the post-game plot (which admittedly can be argued is equivalent to SwSh's Post-Game plot in terms of length and general design and I accept that the two can be cancelled out in that regard) suggests to me you forgot what BW's post-game actually was. Also let's not forget you're given Post-Game rematches against Cheren & Bianca that aren't just part of the League Rematch also you have the Post-Game Cynthia battle as well as the boss fights in Volcarona and Kyurem during the Post-Game (as well as Landorus if you've got its counterparts).
Pt.1/2