So should I stick with Bitcoin Core or migrate to Electrum?
I like the way to just store a small seed phrase.

What's the "inactivehdseed" in dumpwallet?
My wallet is encrypted since day 1.

Can I export the master private key?
So that I can store the information on paper?

I use the lastest version:
Bitcoin Core Version v0.20.1.

The wallet was created 2 weeks ago.
What about password change. Does this invalidate the HD wallet?

Is Bitcoin Core using a real HD wallet?
So I can backup the first wallet.dat and that's it?
(like Electrum does with the seed)

Otherwise I have to backup the wallet too often.