Ugh you guys are making it so difficult to choose the templar path this time around. I don't care about approval so much as story flow.
As you're leaving Orlais "Fiona" stops you and invites you to Redcliffe. At that time it makes sense that you go there, even if you have enough Power to do the templar mission, because of the circumstances. Then you get there, talk with Alexius, get a note from Felix, and meet Dorian, at which point he tells you about the scary time magic and how it's super important to stop Alexius before he rips a hole in time and makes everything worse. The urgency is there for choosing the mages that I feel is severely lacking with the templars.
If you then choose the templars after this (which had been my plan on the next play), of course it makes sense to get a large amount of disapproval from Dorian: "I told you this was a huge problem, you didn't act [by going to the templars], and look what happened." [Not an actual quote.]
To me, NOT going to Redcliffe first is logical only if you choose to ignore the other cues the game is giving you. And then once you actually get there the game directs you into the tavern to see Fiona which starts the ball rolling on everything. You can of course ignore the note, but that would be really lame.
I don't think the story aspect of these two choices flows well at all, and aren't presented with equal weight in the lead up to the decision. The actual mission itself is irrelevant at this point, since you make the choice before you go on it.
I suppose the very best for the story would be to ignore Redcliffe completely. After Fiona invites you, the game directs you back to Haven's chantry where you have a chat with the advisors and then see the templar mission available for 15 Power. You also have Cassandra's concerns regarding the Lord Seeker's behavior to urge you onto the templars at this point.
This sucks all around. I'm almost at the point of making a girl rogue just to pick the templars so I don't have to deal with this.