I can only compare STI short reach (same as Ultegra at least until last year) and Campy Chorus triples. Campy is easy, clean, fast and accurate - and not finicky. Ultegra? Well, let's just say it only stayed on my bike about 6 mos.
Think carefully about downtube shifters. I am not slamming the technology but you'd be setting up a bike with older technology and harder to find components that could be hard to support. You might need to be the one with the knowledge for what to use and how to maintain. Some people just want to drop off the bike at the shop and pick it up when it's ready. Not every shop has superb mechanics that will know how to work on anything you want. Sometimes the mechanic is a highschool kid that doesn't know anything about older parts or have the interest in working on something that doesn't look like the bling of the future.
Does the new bike have triple compatible levers already?
BTW, I swap cassettes all the time but I'm not racing. I just live with the long cage derailleur and chain.




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