Adding more warnings will just make people click through it without reading. Any warning that you see many times, gets ignored. I like the Linux CLI default of never asking for confirmation. If you're not sure about something, don't tell your computer to do it.
Bitcoin Core lets me wait about 3 seconds before I can click the final button, and that feels kinda slow

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There's a bigger problem with this: "if you design something to be foolproof, the universe will create a a bigger fool" (I don't know who originally came up with this quote). More disclaimers and warnings just lead to dumber people who don't think, because they expect to be protected everywhere. I'd much rather see people think before they do anything.