First of all, the majority of exotics not being upgraded are very desirable (or will be when the taken king comes out).
For example the gjallarhorn - some people have played over a thousand hours and still didn't get this weapon until our sold it recently. On top of this, it will be obselete in TTK content thus making it essentially useless - and just to rub salt in the wounds it is being patched to be less desirable in current year 1 content. I wouldn't say that bungie as a company are being very loyal to those who only recently got the gjallarhorn.
Another example is the vex mythoclast. Originally this weapon was god like - fair enough that it was patched. But nevertheless, this gun is a fan favourite and deserves to be upgraded.
The hard light has had a year of rejection and yet another one too in because in the TTK content it will be useless as well... yay
Ok, this is where I am very, very, very frustrated with you, bungie. After about a half a year of Necrochasm being useless, you decide that it needs a buff. Ok. A year. This weapon requires a seemingly endless amount of effort to obtain i.e. getting the husk of the pit, killing 500 hive with it, obtaining the embalming orb to upgrade it to the legendary rarity of eidolon ally (requiring eris morn rank 3 which you can only get to in consequence to grinding bounties every day and doing the storyline) and finally, getting the crux of crota. Bungie. Bungie. Bungie. After all of that a 5% RNG drop rate? Really? And after all of those steps you can finally get a really bad weapon...great, now I really feel like I am using my time in this game efficiently. In other words, it was a good idea to buff it, but maybe a bit sooner next time. Oh but at least now in the taken king it will get to the new attack value along with the buff... Or not. ARE YOU SERIOUS, BUNGIE?!?!?!?!?!?! YET ANOTHER HUGE AMOUNT OF TIME WHERE IT IS USELESS. NOW THERE IS NO INCENTIVE TO GO TO PREVIOUS RAIDS!!!!!!! "Oh but it will be good in most crucible game types" BUT NOT IRON BANNER OR TRIALS OF OSIRIS, THE TWO MOST POPULAR GAME MODES. This is a joke.
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It's not laziness or stupidity, Loot is the main form of progression and drive for this game. If you can use all your favorite year one weapons in year two, why would you use the new ones? That's why a lot of people left after house of wolves dropped.