The phrase "all too legitimate" is correct and usable in written English.
It can be used to emphasize that something is very valid or justified, often in a context where one might expect it to be questioned or doubted.
Example: "His concerns about the project delays were all too legitimate, given the recent setbacks we faced."
Alternatives: "entirely valid" or "perfectly reasonable."
The Floyd case may never reach the stature of 1954's Brown v. Board of Education, but if the plaintiffs are successful, it would be a major step in addressing all-too-legitimate grievances that minority communities have against big-city law-enforcement agencies.
"Jim was central to creating something that, from then on, was too powerful and too legitimate to be stopped," Professor Heymann said yesterday.
In the case of Snape, it is all legitimate too: he is horrible to Harry, and our resentment grows with his.
They too have legitimate concerns about inequality and a lack of fair representation.
"Too many legitimate lenders are being tempted to get into this because of its profits," Mr. Raines said.
Too often, legitimate but competing interests collide to create inertia, which means patients do not get the care they should.
I have accidentally deleted too many legitimate e-mail messages lately in my zeal to purge my box of ads for Viagra, mortgage guarantees and worse.
Russian mobsters, led by a silver fox played by Rade Sherbedgia, have their hooks in Buck and Wayne, and a shady lawyer, played with marvelous relish by James Caan, is also around to keep things from getting too boringly legitimate.
But the rise of multilateral efforts to counter illicit flows of money through the international banking system in recent years has made it possible to tighten restrictions at home without driving too much legitimate banking activity abroad, officials said.
In his essay, O'Reilly draws broader philosophical lessons from such technologies, arguing that they work because they rely on "a deep understanding of the desired outcome" (spam is bad!) and periodically check if the algorithms are actually working as expected (are too many legitimate emails ending up marked as spam?).
