To me it feels like an barrier to entry, restrictions imposed on regular actions, and a form of mechanism for protecting the pureland.
To me, only vow #10 raises some worries when I first read it. The other vows in the set of 48 vows seems like wonderful blessings and rewards.Vow 10
Provided I become a Buddha, if the beings of that country of mine should have arise in their minds the idea of selfishness and covetous thoughts, even with regard to their own bodies, then may I not attain the enlightenment.
If, when I attain Buddhahood, humans and devas in my land should give rise to thoughts of self-attachment, may I not attain perfect Enlightenment.
And when you analyze the undesirable traits of our current human Earth world / Saha world, some might argue that some degree selfishness is necessary for self-preservation and survival, because of many undesirable limitations set in this world . Examples: energy requirement to drink water and eat food (otherwise die of dehydration or famine), limited amounts of edible food with lots of poisonous/non-ediible varieties, time waiting requirement and space requirements to grow food or filter clean water, bacteria & fungal growth spoiling food, extra ....etc. That seems to be part of the reason why selfish hoarders for wealth exists on Earth, so I can imagine a lot of wealthy capitalists would deride someone who practices selfless-ness as being foolish and unrealistic.
But I understand that selflessness is an very important aspect towards the the general Bodhisattva practices, and to prevent downfalls. And there is a lot of reasons why selfish acts can lead to a hell-like world, especially if taken to extremes.
Such as when selfishness being taken further to the point of exploiting and hurting others with horrifying consequences (eg. theft / wars to take others' resources, monopolistic/cartel patent laws, labour abuse, income inequality ...etc).
So to prevent these downfalls, I imagine Sukavathi / Buddhist Western Paradise Pureland must not have these same drawbacks of our current Saha world / Earth, like limited space or resource quantity or time requirements?
What are the implications of the non-selflishness? Maybe no currency, no trading , no courts, nor any form of self-preservation restricting others are allowed (nor necessary) in the purelands? Would that be too restricting?
So to play it safe, for more compatibility & better chances to enter purelands in the afterlife: I suppose we should try to practice selfless as much and as feasibly possible in our current life? (Like sharing and charity) Is it even possible or feasible to imagine a world without any degree of selfishness? (Right now I can only imagine the life of an poverty monk/ascetic as being fully compatible with this vow #10).
Note: some extra reading materials I plan to read up after posting this:
viewtopic.php?t=6811 : 2 types of selflessness
viewtopic.php?t=30872 : Is idiot compassion a thing?