You are at the beginning of your journey with these trees, so before you start telling me I'm wrong, let's see if you still have them 25 years from now. BTW that die back is telling you something about the future...
I never once said you were wrong.
Fake internet points and membership time on this forum not withstanding: I left behind a large portion of my collection 10 years ago as part of a move out of the country into the suburbs...I only started beefing up my collection again about 3 years ago in anticipation of a move back we hope to make next spring. I do, however, have several specimen in my collection aproaching or just over 30 years in my personal care. But sure, let's talk about these specific trees again in 25...
...and yes, the dieback is telling me something. I even stated what it's telling me. It's telling me the tree dehydrated. Browning and brittle
branches from the bottom of the tree up is a classic sign of dehydration in sequoia. Why was it dehydrating? I said that too. We stayed below 0F here in February for almost a week solid. Had I kept these trees outside, they'd be dead. Even in my unheated garage, the rootball froze for a time. The humidity at 0F is practically zero. Physics. Evergreens transpire year round. Frozen roots can't intake water. I happened to be out of town that week or they would have come into the house for a few days the cold was so extreme. These trees are too young for those conditions.
I'm not arguing with you, I'm agreeing with you. But I resent the insinuation that I'm a young punk who doesn't know shit. If you really feel that way...put me on ignore.