You are absolutely right in all of your thought processes spelled out here. Especially when it comes to timing.
Timing is very much isolated to how an action feels, not how it performs. Feel is subjective to the user, not a standard. However, a timed trigger does give a LOT of people warm and fuzzy's when it's done right. And, as stated in this thread, we will do it for free if you send your trigger to us prior to your action shipping.
If you know how to turn an wrench and install a few screws, you can assemble a rifle. To echo what a lot of people have said, assembling a rifle and fine tuning a rifle are two different things. There may be some feed lip tweaks here and there to get it right, but it's not rocket science with high quality components and some good tools.
We have faith in our customers to get it right on their own, but we'll always be there to talk something through with you if you need some advice on what to do and where.
Thank you - Ray