The answer can be long but I will make it short. Because it is in a Browser.
You make one mistake in your life by clicking on a malicious link. Or you forget that your employer have all his computers recorded and you change your SEED phrase while using it. You are done. For mass adoption, where people click on every link, everywhere, use public computer, etc, seed phrase are really bad.
If we stay only our gang, and keep crypto only for ourselves, no problem.
And the worst, if someone have your seed phrase by one of your mistake, you will never know it. There is no Login recording, no 2 or 3FA. So the thieft can look at you loading your account for years, and then, strike. Login to your identity, remove all your devices and add his.
I prefer Ledger Nano and Yubikey. The thieft need your phisycal device in have to log in your account. Much more difficult to do.
Storing seed can also be a problem for many average users, but this is something else.
At least, split your seed phrase in 2 parts and store them 2 different ways while hoping your browser and computer were totally clean while creating it.
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