This has been discussed between Netops and WMCS but I couldn't find any existing tasks. Feel free to mark it as duplicate if needed.

I documented the reason on https://wikitech.wikimedia.org/wiki/Network_best_practices#Servers_uplinks

Other than Fundraising tech, most servers with two physical interfaces are from the WMCS realm.

I lost the historical context on why they initially got setup that way (software limitation, easier, growth/bandwidth expectations, etc), but through this task we should re-evaluate it and see if it can/should be streamlined with the production side of the infrastructure. What are the current benefits compared to its downsides (from the wikitech page).