Pokemon lost its soul when it started uniformizing when starters got their secondary type. And yes that includes when Rowlet loses its flying type; a starter losing a type on evolution is a good idea, but it’s completely ruined by having it happen at the same stage as the other two get their secondary type.
Before, starters actually felt like three unrelated monster lines that got put together simply because the prof ended up getting them. Squirtle never gets a secondary type, Charmander has one on its final stage, Bulbasaur always has one. Piplup and Turtwig get it stage 3 while Chimchar gets it stage 2. It feels organic. The only exception is Johto where none of them gets a secondary type.
Since gen 6, it started feeling more like the starters were designed to be mirrors of each other and get the exact same things at the exact same time, which is lazy, soulless game design that doesn’t make any sense lore wise.