DanielT wrote: 
there are so few that it is so easy to forget.
One more now.
It's all your fault. Due to your constant raving about PCB mount I completed my first plateless 60% keyboard yesterday.
I hadn't touched a soldering iron in almost six months because I was quite happy with my wooden daily driver:
But now I finally wanted to see for myself, so I took a Satan Gh60 PCB and an old g80 and got going.
The switches are old MX blacks, DanielT style, with 60g springs.

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My conclusion is that
plate mount on 60% is a joke, and should be done for aesthetics only.
The keyboard sits in an aluminum case from Aliexpress, and there is simply no visible flex.
Similar to what people who bought a PCB-mounted Uniqey keyboard reported,
it feels extremely solid, you cannot compare it to the wobbly plastic offerings that Cherry themselves made.
At this size, using an aluminum case with six standoffs, there is almost no room for flex. The switches become slightly more wobbly to the side, but it's not something you would notice while typing.
What you do notice however, is that it sounds much better than adding another layer of resonance with an aluminum plate.
Aluminum plates on 60% add noise while hardly improving the typing feel.
I have 2 keyboards with SpriTs 5mm acrylic plate which looks unique and deadens the sound.
But I have never kept a keyboard that had an aluminum plate.
So maybe you can add a plate if you don't want to see the PCB, I guess...
I just ordered some QMX clips to further decrease the noise output.
For silencing clips, 27€ from Germany sounds a lot better than 60$+shipping from the States.
For those who have plate-mount keyboards, I heard Uniqey are also working on plate-mount compatible QMX clips, essentially Zealencios for half the price (and from the original inventor of silencing clips).
In conclusion, PCB mount saves time, money and noise on 60% keyboards. Thanks DanielT! 