This is an MMO. It is, by definition, open ended. You cannot, by definition, finish and complete your character.
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Honestly, from your description it sounds like the toxicity problem stems from your guild and the attitude you guys bring to the game, which then permeates into the features you experience. If a bunch of people all choose to be cynical and negative, it's hardly surprising that all believe that that is the only way to be.
In our guild it's always a nice thing when anyone in our raid gets a nice TF. Also, it's not just about the brief sense of elation when we get an upgrade, the steady sense of getting stronger and how that translates into helping our raid progression is also a big factor.