I like when they embed views (e.g. PowerBI) in it, but as soon as you click off it to see a message and click back, it has to reload it all. It's like IE6 - a pre-tabs browsing experience.
On some mobile apps (Gmail, Discord, Telegram, etc. On Android, never used a modern iOS device to know the situation over there) there are embedded browsers enabled by default, but they are not very persistent and have no actual browsing UI.
My mom was buying something from a link she got from a friend, and was unable to complete the transaction because she had to open another Telegram conversation to get the payment details (hey don't judge non-techy people's organization skills!), but of course going back means leaving the browser-view, so once she had the details at hand she couldn't go back to the store to finish the purchase.
That would be "fine" if there were a consistent UX to "no, i really mean to open this on my browser app, not on an embedded view" or if embedded views were opt-in, but as it stands, it is one of the classic attempts at "simplifying" things that actually makes the whole ecosystem more complex and obscure.
This isn't helpful for less technical users but most embedded browsers have an option to open what you're looking at in the real version preserving state. I find this handy to quickly peek at something while conceptually still in the app that opened it, and then go to a real browser if necessary.
