One last question. Is it more secure to generate a 24 word seed using dice/coins (manually) OR using CSPRNG present is software like electrum etc ? Which is more secure?
In both cases the seed phrase is generated completely randomly (assuming your dice is balanced and all the numbers have the same probability to be chosen) and is secure enough.
It may worth mentioning that, if you want 100% security, you should generate your seed phrase on an air-gapped device.