Do I really require a VPN to stay protected in unsafe networks/internet from bad actors/hackers or DoT/DoH is sufficient (as most important websites that store any personal data use HTTPS connections) ?
All DoT and DoH protect is the dns query and answer. That’s it. Has nothing to do with encryption of any of important data in transit
I am not taking privacy into concern here. Using DPI , website visit history can be known by ISP. What I am concerned is about leaking personal info like login credentials or any such confidential data. A targeted attack like you mentioned would mean that, OS like Windows and Android can be hacked remotely . In that case a good percentage of the whole world would have been hacked at least once by now I guess… Having OS up to date and AVs installed , I think OS targeted attack shouldn’t be an aspect of worry.
Yeah…soo…DNS transaction are encrypted and then connections to websites (at least all the important ones that store personal info) is encrypted using HTTPS. So do I need a VPN for security purposes(excluding privacy requirements like hiding my web activity from the ISP)?
No. No one can see inside your HTTPS connection unless a proxy terminates it and then you’d get certificate errors or they’d need to install their CA on your web browser, which you’d also know.
You can use a VPN to hide where you are, but ISP’s really don’t give a shit where you go. If it’s illegal, they’ll know from law enforcement soon enough