I'm totally 100% ok with it. I'll take this as an alternative to them becoming useless which is the norm in MMO type games. Think of it as a new exotic which is really what it is. It's like going from legendary gear to raid gear. They are both purple but one is more powerful. Your upgrades don't transfer. You are trading in your old lower level exotic for the new higher level exotic. You should be happy that that is even an option, instead of having to grind for a brand new exotic.
"You should be happy that that is even an option, instead of having to grind for a brand new exotic."
Ummmm we have to still grind the exp for the exotic after we upgraded to the better version.
Grinding the xp is better than praying to rngesus for a drop. I'm amazed at how many people that play this game aren't familiar with mmo concepts. Generally when an expansion comes out all your gear and weapons are useless. This is a much much better solution.
Your gear becomes useless for the expanding content to a degree for sure but not within the confines of a the previous content as well. And boosting to 90 is needed to sustain/expand the fan base but boosting in a game as immature in its life cycle as Destiny is dangerous