Those social media companies stores user data on clouds so they literally have a way to help reset passwords and have access to their accouns. But that's far different from seedphrases where if you mix the words, you loss one or more, then getting access to your funds becomes difficult.
Yea, it's possible to brute force your seed, but the chances of you recovering your keys are very low. Fact is, we don't want to mess with things we don't understand. Upon joining this forum, I've come across several ways to store our keys but just few of them are worth a try. it's better to use methods that have clearly been tested and trusted for years now and store our seed using them...
Better to be prepared than only rely on your brain.
It is prone to make mistakes along the way..

It's unsafe for anyone to develop trust issues or feel insecure to the extent of memorizing their bitcoin wallet address without setting up a manual back up system should in case he mistakenly forgets a single character in his seed phrase which may cause him to be denied access to his coins just like some abandoned wallets without their seed phrase to claim ownership. No matter what happens I'll always recommend backing up your seed phrase manually.