Completely agree with this statement.
I don't blame the bureaucratic (eg. intelligence, immigration, etc) systematic failures that lead to 911, 9 months into Bush's term, on Bush just as I also wouldn't blame the similar bureaucratic systematic failures of Wuhan-19 on Trump, 3 years into his term.
Now, Bush's policies on illegal immigration, out sourcing of American jobs, the disastrous Iraq war and "nation building", among others, are his fault.
Not having access to national security info, I dont know enough about what Bush could have done to protect against 911, to credibly say he either did or didnt do enough.