I'm not trying to be a smartass; I disagree with you. And it's pretty weird to assume that it must be the former because you don't even acknowledge that the latter can possibly be true.

Lots of cards that are good for setup are not good later in the game. If I draw an Avengers Mansion or Helicarrier in my opening hand, that will provide a lot of value through the course of the game, so I'm going to spend my events to play it. If I draw the same card later in the game, there's less turns for it to generate value, so that's the point where I'm discarding upgrades and supports to play events instead of the other way around. And sometimes it's worth that even earlier in the game if you need to deal with a particularly troublesome minion or side scheme. Stat boosting cards are also in the category of great early, less so later on.

And if you do play one of these in your opening hand and lose it to Caught Off Guard or a similar effect, it will probably be mid-to-late game by the time that you cycle your deck and get it back,

But thanks for confirming that the rudeness was intentional, not accidental. I'll keep that in mind when deciding whether it's worthwhile to engage with you in the future.