The main issue with powerful tools is that they get used against you by threat actors.

Our society sets limits based on the most selfish. Our computers get limitations based on the most effective threat.

The only “problem” with the clipboard API is shitty applications blindly trusting client data.

Perl did something right with its taint mode: https://perldoc.perl.org/perlsec#Taint-mode

The only thing wrong with all three things you mentioned is that they're proprietary. Google is not holding the web hostage with W3C standards.