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It gives you an early signal that the relationship won’t work out if the other party decides to contribute nothing for no reason other than to have their cake and eat it too.
I’m of the belief that when it comes to relationships, if you’re thinking about it transactionally, then you’re doing things wrong. As long as being together is a net positive for both parties, then it doesn’t matter if one contributes more than the other.
On a more pragmatic note, you can contribute a lot through non-financial means and these are difficult to quantify, so it’s simply not worth the effort to do that kind of bean counting. If you don’t feel that they’re pulling their weight, then you talk about it and make some adjustments.
Considering how few people block all scripts, this could also make it trivial for them to fingerprint you.