R4R: Show Mnemonic by Default

[alexanderbez]

Show the mnemonic by default.

closes: #3518

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[jackzampolin]

A good switch

[jleni]

It sounds weird and risky to me. The mnemonic is one of the most precious things.
If people want to see it, they have an option.. but showing it all the time?

[alexanderbez]

@jleni the thing is, this is what people are used to and want. As a user, I want to see my seed and write it down safely somewhere. If I'm in the presence of others, I'll manually supply the --no-backup flag (which I'd be doing for demo purposes only I imagine?).

The UX is counterintuitive to me w/o this change.

[jleni]

hehe. Some people are used to play with their mobiles while driving :-)

[jleni]

hopefully most people will use hardware wallets