It's not declining that may burn bridges, it's waiting until the last day and declining that I felt may have been irritating, since as I said, the cohorts are small (in part because the departments aren't funded well enough to take on very large cohorts). Further, I had an offer of aid at the school I chose which I did not disclose to the school I declined until after I declined (they asked), so I thought it may have been seen negatively that I did not try to negotiate.
And yes, if you really want to go into it, sure, both programs were good fits and I could have succeeded at either, no doubt. But the whole process has been stressful and emotional because it's finally accepting that I'm a] losing a great advisor who was a fit on both and professional and personal level (someone I've worked with through my master's but is leaving the school) and b] making a life choice (PhD) which might result in breaking up with a long-term partner. So, I'm glad that for you the application process was simple and rational, but I'd appreciate you not discounting that some of us don't accept change as readily or have conditions that make decisions so straightforward. I can understand the frustration people have expressed over some users seemingly sitting on too many offers, but to come into the thread to tell people how they allow to feel seems pretty unnecessary.
I also didn't say anything about writing letters "stained with tears" or directly say that I was "emotionally troubled".