I wonder if these five love languages begin to blend into each other on deeper analysis. If you like handmade things as gifts, you presumably like them especially when they are made well. But in a way, the time spent on making the gift could be seen as either an act of service or even "quality time" in the sense that it's time spent for a purpose that is focused on you. It is as if the person hands you all those hours/minutes when giving the actual gift. Also if we are talking about cards or letters, there are probably some words of affirmation involved. So it seems that the boundaries between these love languages aren't very clear-cut.
Not true. Time spent is about Personal, one on one interaction, or at the very least, just being around. What you're saying is the equivalent of a father that works 80 hours a week to provide for his family, falsely thinking he's a good father. Meanwhile his kids have lots of toys, but no connection to their father, which is what they really want and need.
Some things made May contain words of affirmation, but that is secondary and not the point or focus.
It seems to make this "blending together" you're suggesting only works if you alter or distort the true intent and meaning of each language.
Words of affirmation - this is about the words given, not the method of delivery. Whether it's verbal, quickly scrawled on a piece of paper or on a hand made gift doesn't matter. It's the words that are important.
Acts of service - this is about action. We see this commonly from wives with children. A husband coming home and vacuuming and helping with the dishes, for example. Again, a hand made gift may qualify, but the receiver is likely to appreciate the work it took more than the gift itself.
Receiving gifts - pretty straightforward here. Likely people tie a sentiment to gifts. It also tells that person you're thinking of them, even when not around. And well picked gifts also tells them you know them well enough to make such decisions. It's generally about the thought behind it rather than the cost, and often times handmade are more appreciated.
Physical touch - pretty self explanatory.
Quality time - is, as stated above, about spending time Together. Spending time apart, but doing something for that person, does Not qualify. It's about togetherness.
Is their love language the same giving and receiving? Yes. That's the whole point. It is the way this person understands how love and affection are shown. They are naturally going to give in the same way they feel to receive.
I don't think the purpose of this was aimed at that, but it may have some connection still.