It's a bit of a mix. Some strains affect most people the same way, while others don't - in particular, neurodivergent people often seem to have a different experience.

And some strains are better at different times of the day too - some can be stimulating, for example.

I'd say it's best for individuals to experiment and find what works best for them, to treat their specific symptoms.

You can get a lot of mileage out of making the indica/sativa distinction. Regardless of strain, inidca heavy tends to chill people out, while sativa heavy strands give energy and more anxiety. Everyone is different and ymmv.

There's a general vibe to the strains that's the same between people but you won't know which one you like or which improves your life until you try. It's more some-sizes-fits-most but not one-size-fits-all

I am suspicious that strains are much beyond marketing terms. Both in the literal sense that people will sell the exact same crop under different brand names. Or sell different crops under the same brand.

I'm also generally dubious that you can maintain consistency in a crop across seasons and growing cycles.

It's theoretically possible that there are growers using clones and exacting greenhouse conditions to replicate the same product over and over. But it's way easier to slap a brand on something so that's what people will end up doing.