Well, depends on how you define massively. I find paying 65-70% extra is quite a bit. Plus 2 times the labour (either in a shop or your time) and the time invested to sell the used parts. But totally agree that nowadays with high prices in the used market you get good money back for the used parts. Personally I’d rather wait 2-3 years, enjoy the mechanical for the time being and upgrade to the next gen electronic with the next bike.
And in the case of OP. I wouldn’t count on a high resale value of 11-speed mechanical DA in a couple of months… people who are willing to pay the extra for DA most likely want the latest generation.