Is Sudo Almost Useless?

Once an attacker has a shell as your sudoer user (or just compromised a local process enough), he/she can use one of the many privilege escalation tool to even automatically put themselves for example as apt or some other processed called by root to gain root access (see also What can an attacker do in this scenario? (unwritable bashrc, profile, etc.) ).

What's the point of sudo then outside of blocking smaller payloads or making it a bit harder? It seems that the focus should be on SELinux and such.

Edit: There are 2 side of this question (I should have been more specific). First, what I initially meant, for a standard Linux desktop user. A pretty different answer could be given for a machine administered by someone else.

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