There are definitely variations between different authorities (NHS, FDA, etc). FDA RDIs provide a sane default, and users can update nutrition preferences based on their health goals.
RDIs are based on an 'average american' diet. What you actually need nutritionally can change significantly based on your diet specifics.
For example if you have a diet high in oxalates, which are present in many leafy green vegetables, then your nutritional requirements for things like calcium and magnesium are increased, because the oxalates bind to the calcium and magnesium and cause you to not absorb it. Thus to compensate for that effect, you need to eat more of that nutrient. If you have a diet free of oxalates, then the amount you need is less than the RDI, etc.
Also a lot of nutrition labels do not modify themselves on the bioavailability of their specific nutrients. Plant protein is less bioavailable and has a less balanced amino acid profile than meat protein, so you need to eat more plant protein typically to get the same total equivalent amount to be absorbed by your body. Magnesium oxide is cheaper than magnesium citrate and is not absorbed enough, so you need more magnesium oxide in weight to have the amount absorbed by your body be the same as a lesser amount of magnesium citrate. But on nutrition labels, they're just going to put milligrams of magnesium, no matter what kind there is.
The entire "scientific" field of nutrition has gone down a wrong path a couple decades ago, and the FDA specifically with their recommendations to eat a lot of carbs has done the public a great disservice.
Outsiders of the field have slowly started to figure out where nutrition went wrong, but since entities like the FDA have spread missinformation for decades, there is a lot of inertia to overcome, which will sadly take another couple decades apparently.
Best examples i can remember ad hoc are probably Gary Taubes and Robert Lustig.
It's pretty clear by now that the obsession with eating carbs is actively harmful and likely the cause for the diabetes and obesity epidemic.
The obsession with polyunsaturated plant fats is next, they oxidize rapidly, even inside our bodies, and cause great damage.
The issue for nutritionists is one of credibility, how does a scientific field collectively turn on a dime and proclaim literally the opposite of what they have claimed in the decades prior?
There are definitely variations between different authorities (NHS, FDA, etc). FDA RDIs provide a sane default, and users can update nutrition preferences based on their health goals.