No. Grade matters more than species. A well-grown, carefully picked and properly processed robusta beats a defective, strip-picked, badly dried arabica, and both of those things are widely sold.
"100% Arabica" on a bag is a floor, not a quality claim. It tells you which species you are drinking. It tells you nothing about whether the cherries were picked ripe, whether the coffee was dried evenly, or whether it was roasted three weeks ago or three years ago, and every one of those matters more to what is in your cup.
Where the prejudice came from
The dismissal is not arbitrary. It has a documented history and it was largely commercial.
Robusta was barred from delivery on the New York Coffee Exchange in 1912. In 1921 the US Bureau of Chemistry ruled that it could not be sold as, or labelled to imply, Java. The species was legally excluded from the American quality market more than a century before anyone described it as the bad bean, and the reputation outlived the regulation that created it.
There is a second layer worth knowing, because it inverts a lot of received wisdom about national taste. By around 1960 roughly three quarters of the coffee drunk in France was robusta, which required dark, heavily caramelised roasting to mask the bitterness. Dutch and Belgian preferences for dark roast track their own robusta-producing colonial supply chains. Southern Italy's robusta preference began as economy and hardened into tradition.
Several of the "traditional national roast styles" people discuss as matters of taste are colonial supply chains that became palates. That is a more honest account than the one usually told.
What robusta is genuinely good at
Crema. Its lower oil content produces a thicker, more stable foam, which is exactly why it appears in traditional Italian espresso blends.
Body. It brings weight and a heavier mouthfeel that some espresso blends are built around.
Caffeine. Roughly double arabica's, if that is what you want.
Surviving. It resists leaf rust, tolerates heat, grows at low altitude and yields more. Those are not flavour virtues, but they are the reason it exists in the volume it does.
What this will not tell you
It will not tell you that most robusta is good. Most of it is not, and the reason is economic rather than botanical: the overwhelming majority is grown for volume at the bottom of the market, strip-picked, processed carelessly, and destined for instant coffee. Buying a random robusta is a bad bet.
The claim here is narrower and worth stating precisely: the species does not determine the ceiling, and grade does. A carefully made robusta can be genuinely good. Very little robusta is carefully made.
It also will not help you find one. Fine robusta remains hard to buy at retail, and most bags labelled robusta are the commodity kind. If you want to try one, you will need a roaster who has deliberately sought it out.
Why this is worth revisiting now
Arabica is the more fragile plant. It wants a narrow temperature band and higher altitude, and it is more vulnerable to leaf rust, which has repeatedly devastated regional production.
As conditions shift, the hardier species becomes more attractive to grow whatever the specialty market prefers, and a deliberate fine robusta category has emerged with its own grading qualification. Robusta's rehabilitation is being driven by climate, not by palate, which makes it one of the more consequential quiet stories in coffee.
We do not sell coffee, which means we have no bean to defend and no subscription to sell you. That is worth saying here, because almost everyone else writing about this does.