HHKB (keyboard) is overrated (quality of case, inconsistency)
I've tried a hhkb and it's pretty good, I don't see what you mean by inconsistency, and yeah it's a plastic case but it's pretty durable.
vintage blacks are overrated
Vintage blacks aren't overrated but there are misconceptions about why they are so good. Good vintage blacks are good because they are broken in a lot from years of use, there are different molds and they are the first tooling but the break in is the biggest factor in why they are so smooth. That's why NOS vintage blacks are not worth your money, they are basically just slightly better hyperglides. Although a lot of this is based on batch variance.
If you lube your switches with 205g0, you are muting and removing their sound profile, different linears will sound the same after. 105 on the railing is all that's needed.
Yeah 205 makes switches so sluggish, I have lubed 2 batches of switches with 205 and one is alright feeling and sounding (a batch of tangerines) and my batch of full milky switches is so sluggish, even the best switches in that batch are still kinda sluggish (I'm pretty bad at lubing with 205 so it might be a skill issue), they also sounded too muted as well.
3204 or dry based lubes like ro59 or ptfe powder are much better for switches.