You also may be shocked to learn this, but "proportional" doesn't mean 1:1. It can mean 1:2, 5:1, or x:x^e(2*pi). All of those are proportions. Words do have meanings, and you'll note that - while I didn't even misuse the word proportional - the quotations also indicate I'm using it more loosely than it's textbook definition. You know, like how a normal person might.
I'm getting the vibe from you and the other commentator that, to you, this is about comparing how much two people love their respective mothers. That's not at all what this is even about? You can't compare "how much" two people love a respective person/thing because love isn't quantifiable.
I'm really not sure what you're even taking issue with? The idea that more time and effort from the giver corresponds to the receiver feeling more appreciation? That is not exactly a hot take lmfao
Do you feel disappointed in that answer? If yes, then surely you see that appreciation of something can be relative to effort.
So if you sit down and thinking of what to write to express your love to your mom for two hours, then you love your mom twice than the person who only sit down for one hour loves his mom?
It's what "proportional" means. Words have meanings.