no bending whatsoever.........
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I have both the 2019 2.4 and 1.4 and I can tell you there is basically no difference......
Do you mean no difference in bending when pressing location I mentioned on keyboard on both 1.4 and 2.4?
Because today I had saw both 1.4 and 2.4 demo units at the same shop and I was able to feel the difference in materials. It was quite noticeable that keyboard bend more in 1.4 in the middle (between keys G and H) and also left part of the keyboard was bending more. However from H key toward right bending was practically none and it was the same as in 2.4. In 2.4 model there was no bending in any location of the keyboard, so I think it may be after all due to dual fan making kind of a support underneath the keyboard. Do you hear that difference in your units?
Shop had quite a lot ambient noises from other peoples, air conditioning and such so it was hard to test keyboard noise but when putting my ear close to keyboard I noticed that in 2.4 keys were silent in all location while in 1.4 model keys above cooling fan were as silent as in 2.4 but towards middle and from there to the left it got noisier. Anyway very hard to hear at shop conditions. Keyboards felt quite similar under finger. Hard to say but just as if both were a little softer than mine but it could be partly just from noise that did cover hollow sounds at store, and probably hollow sound is what makes keyboard keys "feel" stiffer to press. Or there are different keyboards randomly used. I checked demo unit manufacturing plant and date. It was from the same plant as mine and manufacturing date just little older than mine.
I also turned both units over and tested bottom plates by lightly knocking them with my knuckles. They both had the same hollow sounds when placing ear close to the bottom plate. Obviously some Pro model feature because in my Air 2018 bottom plate felt and sound completely solid. Or was that from the swelling battery? That unit had weak battery so who knows...
I also quickly checked displays and they were pretty identical, even colors seemed about the same, just some difference in color temp. Both had very slight uniformity so that left part was reddish and right part bluish slightly darker (very suble and hard to see).
In 2.4 wa LG panel and in 1.4 was the same as mine. I also noticed that this FMX may be referring to serial number. In 2.4 with LG panel also show the same length string starting with F but after that no the same but had same number of characters in it, so it just may be referring to serial no. In 2.4 ioreg command clearly said LP.... so on as panel type, so definitely LG but in 1.4 there is nothing clearly shown with the same command other than that FMX.... So it remains a mystery, what the panel really turns out to be.
Interestingly 2.4 model had SWD battery (maybe referring to Sunwoda?) and 1.4 had SMP (Simplo) just like my 1.4.
So in short chassis bending in keyboard area was much worse in 1.4 while 2.4 was almost solid as a rock.
Keyboard keys felt about the same how they felt under finger when pressing them. Keyboard noise was louder in 1.4 from keyboard middle and toward left, but was about the same in right part keys, but that noise test was very hard to make in conditions at the shop.