Remember when you beat Surge in KANTOOO you need to go back to Cerulean then head to route 9, 10 then go through lenghty Rock Tunnel, then go to Lavender Town, then to Route 8 and finally to Celadon City to challenge both Team Rocket and Erika?
Or in Hoenn...after beating Wattson we;ve headed to routes 111 ad 112, then Fiery Path, then Route 113, Fallarbor Town, Route 114, Meteor Falls (plus optionall Route 115). After that we've headed back to Route 112, got to Mt Chimney via cable car, dealt with Team Magma/Aqua and finally headed to Lavardige via Jagged Pass to battle Flannery.
Even in Kalos which already had few small gaps between gyms 4 and 6... After beating Valerie we had to deal with Team Flare in Pokeball Factory, then we've headed to Route 15 aswell as the optional Lost Hotel and Route 16. Got to Dendemille Town only to head to Frost Cavern to deal with Team Flare again. Then we got back to Dendemile and went through the snowy Route 17 and finally reached Anistar to challenge Olympia
What happened with Galar? Why is it so short route-city with gym-short route-town with gym etc? Where's the adventure?