Why masternodes for onion-network (without "normal" public ip) are blocked?

[cryptocoinguru]

Why masternodes for onion-network only blocked? I noticed some other coins/masternodes like dash, pivx and so on explicitly allow using TOR-Network only masternodes.

1. https://github.com/PIVX-Project/PIVX/blob/master/doc/tor.md
2. https://github.com/dashpay/dash/blob/master/doc/tor.md

NYX seems basically to implement (fork?) the same features used there. But any non IPv4 and IPv6 address (like Onion-Address) is blocked and giving "Masternode not capable" or "Invalid IP Address".

Is this a desired limitation or a side-effect of the IP Address validation in the code:

1. nyx/src/activemasternode.cpp

   Line 143 in 30ba1ed

   bool fFoundLocal = GetLocal(service) && CMasternode::IsValidNetAddr(service);

2. nyx/src/masternode.cpp

   Line 267 in 30ba1ed

   bool CMasternode::IsValidNetAddr(CService addrIn)

[cryptocoinguru]

I think this is the corresponding PIVX change that allows address validation for onion-masternodes:
PIVX-Project/PIVX@de45ddc