Yes, because he was a crucial component of the team and beloved by the fanbase -- and the move to trade him precipitated the 're-tooling' era that we find ourselves in now. And there haven't been any moves since. So it's a fairly natural line of debate.
Also, don't you find it contradictory that the team moves Heyward under the flimsily evidenced auspices of 'He wanted big bucks' but subsequently involves itself in the process of spending those big bucks anyways?
Saying that the Braves didn't see Heyward being worth the money is essentially the same thing as saying they didn't want to pay him $25MM.