I agree. As it is common in modern fiction, people see it and focus on it.My observation is that there is a widespread preference (though not universal - see eg @TwoSix above!) to start play in a low stakes environment - like a tavern or the city gates in D&D, or a starport in Traveller - and then have a situation with actual stakes emerge "organically" from there, by way of player action declarations for the PCs.
The Lord of the Rings is the Ur Classic here....I'm not 100% sure of the origins of this preference within RPGing, given that it is not what Moldvay recommends (he recommends starting at the dungeon entrance) nor what Gygax describes in his DMG (which, again, has the PCs starting at the dungeon site). To me it seems connected to literary tropes, where the author starts the character in a low-stakes situation and then has the action rise as the situation is established/revealed - REH's Tower of the Elephant, LotR, Star Wars (for Luke), I think Dragonlance (starting in the tavern), all work like this.
It has also been the TV Formula for action, adventure and drama shows for nearly 100 years: show your main characters relaxing and having fun. Then do a sharp 'Hook' for the episode, and fade to the opening credits and commercials.
For RPG's, I'm not sure where it was first said, but by 2E that idea was sure firm of "start your game in a tavern and let the players role play their characters a bit to 'warm up' ".
I agree, though there is no limit on how I would start a game and I don't think the players need to be "aware" of anything.I think a GM has pretty wide latitude to start a game by framing the players into a specific situation, as long as the players are aware of this. None of that power is railroading.
I almost always start my games in medias res, with a group of PCs who already know each other and are comfortable working together.