Winning = achieving the ultimate goal.
The ultimate goal in Destiny 2 is 100% cosmetic - it's about equipping a full set of the "coolest", most unique or supposedly rarest gear (exclusive gear) in the game. That gear is only obtainable from Bright Engrams (which are purchasable with real money).
Winning Destiny 2 is NOT about completing every mission - this is obvious as the gameplay revolves around grinding. What do you grind for? The best gear - and ultimately to become the "coolest" Guardian to walk the planet.
"Cool" = cosmetic
Almost all cosmetics (and the best) are only in Bright Engrams.
Bright Engram contents change each season, and additional bright engram variations are the sole source of unique cosmetics for events such as the Dawning.
As the cosmetics change within Bright Engrams, never to be seen again once the season or event ends, they become exclusive.
Destiny 2 is pay-to-win, as "winning" is this game is classified as owning the most exclusive gear. It is perfectly clear that this is intended by the game designers, for the reasons expressed above.
P.S. I am purchasing no further expansions or sequels to the Destiny series. As expressed above, this game's primary design philosophies [as a storefront for micro-transactions preying on the natural human trait of the need to compete] are in no way different to those of the highly controversial Star Wars Battlefront 2. I will not support this design philosophy and therefore the Destiny franchise.
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I don't see how cosmetics and poorly designed armor sets help you "win" any better...