Agreed. Some people just don't understand the time it takes to develop things. It requires so many different stages from concept, prototyping, testing and iterating to more testing. Bungie have said so themselves that it takes roughly 3 months to develop an adventure. That should hopefully give some context on how long it would take to develop a whole raid. You also can't expect them to add or change features overnight. You can change one thing in one place and completely break something somewhere else.