A fancier and more colourful launcher.
The opportunity to log the number of hours you spend in game.
The ability to write a review on the Steam platform.
Within the actual game of Elite: Dangerous itself? Nothing at all. It's the exact same product as the one available on Frontiers own website.
There is also native live stream broadcasting of gaming and automatically updating the game; trading cards, mods, other things that you might not care about but be sure that others do.
If one lives in an internet weak area the automatic updates are a big deal. Having the game ready when you get home from work or school or don't have unlimited time is something wanted.
Convenience; bottom line there is high demand.
There are a lot of super fans of steam, just denying keys alone would be bad for business, no matter how many times it's argued that it's stupid to demand them ( a perception difficult to change).
It is very likely telling backers that love steam, that they can't have steam keys, will increase the flames.
If backers get steam keys the late coming haters (and a couple early) are not going to be affected.
The poll should be enough by itself.
The counter argument is generally: 'I don't feel that I need it so you don't either and or you don't deserve it or it will cost an exorbitant amount of money'
Actually the more it Is discussed and argued about the more attention it gets, which favors the steam keys being given.
The thing about the review ability:
Backers are the ones that originally believed in the game and loved the concept/wanted it to exist.
Not many people would spend 150 to 300 + dollars to test a game that they weren't in love with the concept of.
Fantastic reviews would be written by people that have been testing it from the beginning.
Instead the game is being reviewed almost entirely by newcomers that have little experience comparatively, who may or may not be in love with the game concept having bought it from a larger pool of reasons.
They are the ones writing the reviews now.
I would pay an at steams rate cost recovering fee for a my game compatible steam key scenario but that would probably seem half done to many.
I am pulling for an official 'We have the steam key thing sorted out now and all of our backers get steam keys too!' --something similar
hooray