That's fair. From my perspective, it's relatively easy to generate supporting fiction from rules inferences (like magically empowered humanoid monsters being fiends or elementals), but I can understand a desire to have some of those inferences be more concrete and detailed.
I do have less sympathy when complaints are not "These rules aren't generating a fiction" but in reality are "These rules are generating a fiction I don't like", which is how I view the "ranger spirit pet" complaints. Rangers as a class using magical rituals to summon spirits in the shape of animals makes perfect sense for D&D-like fantasy; if you don't like it, that's a personal preference, not a failure of the game design. Creators are always going to make aesthetic choices we might not like!