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I have just compared the DZ60s, and for me the flex cut sounds "muted", without resonance.

Sound is subjective in my opinion. I would say you shouldn’t trust what people say about differences or similarities due to environmental factors like different setups, different mics used to record, different interpretations, …etc. Instead utilize mods to adjust sounds to your liking by applying a mod then testing it out. Worrying about sound differences between different PCBs when there are other factors that affect it more wouldn’t do you any good.

Do the flex-cuts noticeably change the feel in your experience?

I type lightly and didn't feel any difference, maybe for someone that uses more pressure.

I guess that’s fair. What about the feel? It seems like the effect of flex-cuts really depends on the plate material. For example you wouldn’t feel it on a steel plate but on a PC plate you might.

Yes, what you said is exactly true. The plate material definitely affects flexibility. A PC plate will have greater flex than a steel plate. If you want greater flex, it is actually better to opt for a half plate or plateless build for maximum flex, but of course, you are sacrificing the stability of switches and sound. Of course, the mounting style also affects the flex. A gasket-mounted keyboard typically has greater flex than a traditional tray-mount keyboard. However, the plate material definitely affects it more.

Edit: Of course, I want to note that these assumptions are based upon the sources here: Ways to manipulate sound profile of keyboard: https://www.youtube.com/watch?v=_N8k0u75eLQ&t=603s&ab_channel=Keybored

Methods determining flex: https://www.keyboard.university/200-courses/plate-materials-sizes-9yn46

https://www.keyboard.university/200-courses/keyboard-mounting-styles-4lpp7

That trampoline typing feel is mostly good for novelty, for me at least.

From a practical standpoint, the bouncy typing feeling is not for everyone.

Flex cuts can be nice but a lot of PCBs nowadays have flex cuts because it's the cool thing to do.

The current meta is all about flex and bounce, so having soft plastic plates and a ton of flex cuts on the PCB is going to make the board jump up and down when you're typing on it. This can feel over the top and since all the energy is used up to move the PCB/plate assembly, the sound can be quite underwhelming. Lots of people nowadays don't understand that more of something isn't always better.

Instead of talking about the keyboard feel, people (reviewers and content creators especially) do a "flex test" where they push down on the keyboard with 5 kg of force and showcase how much the plate/PCB assembly bends. That doesn't really give you an idea of how it is to type on the keyboard, but designers and manufacturers accommodate their designs to these things because they think it matters.

There is nothing inherently wrong with flex cuts, but depending on the execution you can really see who's doing it for a nicer typing feel and who's doing it to sell more keyboards because it's the current hype thing.