Don't give people an excuse to deagg their /32 RIPE may only give out /32's but ARIN gives out /48's so there wouldn't be any deaggregation in that case.
That's not what I said. If /48 are accepted by * then people with a /32 or whatever will deagg to /48. I understand now that you were referring strictly to filter limits- I misinterpreted you original post. My apologies.
Obviously you don't need to accept /48's from anywhere- you can restrict it to the PI pool- then /32's don't deaggregate but networks approved by ARIN or RIPE or whomever still work.
You get one shot at fixed prefix size filters, miss and you'll pay forever. Which is more scarce, /32's or routing table entries. If we start giving out /32's to work around filters I'm not sure that solves any problems :) And if no one is going to honor a /48 then why bother to give them out?
-Don