I'm not going to defend all aspects of England's handling of Anderson over successive seasons: some of it has NOT been ideal. On the other hand:

{i} He needed to remodel his initial action as (quite aside from the fact that it was diabolical) he was becoming known (not least in umpiring circles) for being incapable (for technical reasons) of staying off the business areas of the pitch: he was heading towards repeatedly being forced to withdraw from attacks... and thereby being forced out of the side.

{ii} The circumstances that meant he spent years attached to the England circus rather than working his backside off for Lancashire are quite independent of the impact Vaughan had as coach in terms of getting Anderson settled within the team, clear as to what he was in the team to do and confident that the role assigned to him was realistic.

For what it's worth I'd have preferred for him to just go back to Lancs, with first Sidebottom and then Lewis getting the long run as Test-match tea-boy and occasional reserve bowler (a role more suited to a senior, experienced player than to someone still finding their way and undergoing major remedial work on their action).