Now we get to the question many ask at this point:
Why would I need to have a Seed Phrase & go through all this when I can just trust the Custodial Service?
The truth is, there are many instances of that trust being betrayed & people being stuck without any means to access all their funds, especially during times of unrest or even war, which is what recently happened during the Russia & Ukraine conflict this February when Banks started imposing withdrawal limits in Ukraine.
Let's take that scenario further & say that during a time of unrest, or war, you need to leave the country & you can't access your funds at all. You leave & are on the other side of the border, alive but without any guarantee of keeping yourself that way without the aid of others. Your Life Savings are stuck in the country you came from & you have no way to access them.
If you kept your Life Savings in a Non-Custodial Bitcoin Wallet & have your Seed Phrase, let's say you used BlueWallet, you could destroy your phone/computer where the wallet is on, walk across the boarder, get access to a completely new phone/computer, download BlueWallet onto the new phone/computer, hit "Import Wallet", enter your Seed Phrase & start using that phone/computer just as you did your old one, with all your Bitcoin (Life Savings in this case) available to you & only you once again.
For many who keep learning about Bitcoin, they understand that it is not about getting rich quickly, but can rather be seen as you ensuring that you & only you can dictate how you use & store your Bitcoin; when you can & cannot spend your Bitcoin (subject to places accepting it of course) or to who you can send your Bitcoin.