Issue 15653 and imbalanced clusters

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I have a couple questions about

In the ticket Sage discusses small/big drives, and the small drives get more data than expected.

But we observe this at the rack level: our cluster has four racks, with 7, 8, 8, 4 hosts respectively. The rack with 4 hosts is ~35% more full than the others.

So AFAICT, because of #15653, CRUSH does not currently work well if you try to build a pool which is replicated rack/host-wise when your rack/hosts are not all ~identical in size.

Are others noticing this pattern? 
Or are we unusual in that our clusters are not flat/uniform in structure?

Cheers, Dan
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