I agree except on one point: a technically outdated hardware sold ~€350 is not what I'm considering a "sell the hardware at a loss". Not anymore since lonce, at least...
I'm not sure to fully understand your question. So, my answer may be out of topic.
"All of the addon content" (as you call it) is included in the last game update and that's why it weights ~7.3 gb. Activating it, however, requires to install the...
On my console the last game update (1.1.392.3925134) brought a significant improvement concerning loading times. I have ~800mb mods and the 1st load time went down from ~5min to ~1min.
However (while it's not really important) going in the ingame...
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi