why degraded object must recover before accept new io

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Hi
    Let's say acting set is [3, 1, 0], obj1 was marked missing on
osd.0 after peering, new io on obj1 will wait obj1 until be recovered.
So my question is  why cant we do the new io on [3, 1] and let osd.0
keep missing obj1 without wait on recover, osd.0 update pglog only
like backfill does? if the size of osds with newest object is more
than min_size,  do we need to wait recover?

    i see the new async recover feature move the osd.0 from acting to
async_recover_target,keeping acting set bigger than min_size, and
osd.0 being choosen is because it have more missing objects, so
objects missing on acting set still need recover first...

   best regards
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