Hmm , i was working with the assumption you meant tangible results/benefits, seems i was incorrect and i retract my statement partially.
I will however die on the hill that not everything has immediate (or immediately noticeable to be more accurate) effects.
Learning to play an instrument doesn't always result in an immediate increase in ability, same with martial arts (the skill portion, not the physical/exercise portion).
If you limit yourself to only the things that have immediately noticeable effects then you are excluding potential paths for growth.
Ah, so you meant feedback.
Agreed.
I don't think we're actually disagreeing, i think i just misunderstood what you meant.
I do know from personal experience, anecdotal as it may be, that there are situations where certain feedback isn't registered properly, or at all.
This example is fully contrived, but I'm going somewhere after so bear with me.
Take the example of the gym and that the feedback is the muscle soreness experienced after, what happens if that person doesn't feel pain ( again, i know it's contrived ). The effect would still be there but the feedback wouldn't be registered.
I know pain isn't the only feedback here I'm using this specific example as reference.
So meditation is a good example here, especially for the neurodivergent.
Let's take the semi-common comorbidity of Alexithymia.
Not being able to recognise or properly associate the emotional feedback of whatever method of meditation you are practicing does somewhat limit the understanding of the process/benefits.
But, and this is key, it doesn't actually inhibit all of the effects of the meditation.
There is ofc a cognitive aspect to using the feedback to guide what you are doing, but it's not a hard requirement.
Think of it like emotional exercise where at some point your mind just buckles under strain it didn't know was there and up until that point nothing was feeling any different.
It can be deeply unpleasant and even harmful, but it can also be a benefit if handled in a useful way.
I'm not saying it's common, but i'd imagine its more likely than you think.