I'm just saying, your smooth shifting is because of your Ultegra crank, not anything Tiagra on your bike.
I agree with you there (again).
But I noticed a HUGE jump from Sora to Tiagra front shifting (with the same crankset).
Not "as much" more from Tiagra to Dura-Ace 7800 with the same crankset.
And, the Tiagra Rear Derailleur was smoother than anything else I rode
including 105--->Ultegra--->Ultegra SL--->SRAM RED
(except my DA7800 RD which is awesome).
See, I've read that some riders who've had experience with all of those groups
found their Tiagra groups to ride smoother than their "better" groups.
Some have found them to be smoother than their Ultegra 6600 groups.
When you see something more than once from unrelated sources,
(for me) it makes one have to wonder, is there something special about this group?
Some have even said that because they are heavier and less delicate,
that a group like Tiagra lasts longer or can take a beating more.
I think that Tiagra is a sleeper group. Not just for the money. But period.
By the time my Sora/Tiagra group was dialed in, it still wasn't adequate for how I ride.
That's why I upgraded, but for just recreational riding, it was fine.
Let's smokem' peace pipe!