Fair and comprehensive, and I may well have been misinformed about the possibility of a smaller, less involved repair; that said, the explanation I got did seem fairly reasonable, at least in terms of being able to more or less invisibly secure a small breach, provided that the structural integrity of the upper wasn't compromised in some way. I was kind of amazed when Filson sent mine back repaired/relasted in lieu of a new pair, but they've held up OK as beaterboots.
Are your Filson's Goodyear-welted? My explanation would only apply to that construction method. If yours are a different construction method, then a different type of repair may have been possible. Or, they may have simply done the process that I outlined. With original factory equipment and lasts, the process isn't any more involved than what is regularly done during a recraft (assuming there is enough leather to re-last the shoe).