The Zenit was available quickly, cost a very low amount of money, and fit a particular requirement: that it should be easily portable from another room to the bathroom. If I had the strength of two men I'd carry my Focomat into said bathroom for every session, but as I'm not a suitcase special it is. I'm also not going to leave Leitz gear next to where I shower and do laundry, that's just silly.
I tried fitting the other enlarger's Focotar lens on it, but in the 40mm configuration it appeared to vignette (though the lamp was also misaligned; I should try this again now that it's straight), and with the 50mm extension it conflicts with the "safety filter" which I'd have to remove.
Honestly I'm surprised at how low a soviet pain factor this thing has. Most of my trouble seems to have been caused by procedure I hadn't yet had the chance to learn, being previously spoiled by the international German.