High Decay while Sustain is up 100% ?

Hey guys!

I've got a question which I can't find an answer to myself...I have seen in a lot of (sylenth)-Tutorials now that the instructors tell explicitly something like:

"Keep the sustain of the amp envelope up. Now make sure to also bump the decay to 100%. This will interact with XY later."

I couldn't manage to understand so far what this interaction will be, especially because I could never hear any difference. So here's my question:
https://19216801.onl/ https://routerlogin.uno/
What's the use of bumping the Decay of the Amp Envelope if the Sustain is still up at 100%?

Thanks in advance :-) Google couldn't help me on this one...
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