^^This.
I did quite a few A-levels - two humanities, a language, and two science/maths. I naturally have more of an aptitude for humanities, as in I could get high grades in them with much less work; but I was also good at pure maths. In those subjects I could do 2., above. In applied maths, science and the language, however, I was less intuitively good at those and I had to do 3. — much more work.
I have always had to put in more work for sciences and languages than humanities; but I wouldn’t say I did NO work for any of them. I just needed to put more work in for those subjects where I didn’t have a natural or intuitive facility for the subject. In subjects where I just “got” it I could do much less. But I still had to complete the syllabus, write the essays, learn the material, revise before the exam, etc.
I know people who are exactly the other way around, and have a quick intuitive facility with maths/science subjects, and need to do less work on them than essay subjects. I also know people who don’t need to do much work in languages because they have a natural gift for them. My DH and DD are both like that — DD can pick up languages seemingly effortlessly. It’s not that she does no work, though - she just seems to have to do less than I would have to! DH is the same - taught himself Latin and Greek as a teenager and though he has never studied Italian or French, he has picked up a lot just apparently by osmosis, and can read them reasonably well despite having never studied them. (I find it a bit galling tbh!) I was decent at languages, but I didn’t have an especially natural gift for them - I would say I had to work a lot less than many people, because I have a good memory and was an all-rounder; but I still had to work a lot more than those who have a natural facility for language learning.
So, it isn’t that by saying maths comes more easily to some people, that that’s equivalent to saying those people did no work. However, it may well be that they have a natural facility for it that means they have to do a lot less work than you or I might in their place.
But the same is true for other kinds of subjects/disciplines. This is why it’s important to recognise that the general push towards maths/STEM is a bit misguided in assuming that intelligence is just some kind of raw plastic quality that you put into a school subject, add “hard work” and bingo, you get results out.
People ought to be able to develop their skills in a range of subjects, but also specialise in those that they find a natural fit/joy/talent/enthusiasm for them. Sometimes that will be STEM. Sometimes it won’t, and that’s okay.