Basially the title.
Reintroducing a strike a great for the game. Making it a part of your seasonal story works fine as well.
But for -blam!-'s sake don't make people join into the middle of it after much of the strike and its associated story elements have passed. That is absolutely terrible for story progression and spoilers.
Forcing people into a matchmade piece of content for story progression is questionable to begin with, but losing a good chunk of the story because you joined in the middle of the strike? That's just terrible.
If you must put matchmaking into your story missions then disable join-in-progress, at least for people's first time through the story content.
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Agreed. Can you imagine some players 4 weeks from now trying to run the strike to get the fragments?? I know some people wait until most or all of the story quests are available before they even start the content. Or if they're newer players and are carching up? A lot of other people will have finished it already and will be looking to "do the usual" in strikes and blast through as fast as possible. I made a point of doing it today (and I could because I was finished act 2 for a change) once I saw the quest indicating we needed to get stuff in the strike. I thought it would be less frustrating to do while a lot of the player content was still working on it, too. It still took me 2 runs to get all the fragments. I did get transported too, and some of them were looking around as well. It just took one person....then you didn't know if you'd missed the area you needed a fragment from or not.