If your networks are so huge and yet you have failed to scale your infrastructure accordingly so that updating them is not manageable, and yet you have money to change over many of your devices just tells me you have other issues to overcome before changing equipment over.
You don't have the bigger picture here. This has nothing to do with scaling. We actually regularly update most of our network, semi-automated. But only after long term testing, because what is considered stable by Mikrotik is not considered stable by us. And sitting around on a bug like that for a year without even doing anything about it is negligence by Mikrotik.
Besides the fact that you actually believe that a proven long term vendor exists.............
When i say proven long term, then that refers to equipment we have tested long term in an aim to replace quite a bit of our Mikrotik infrastructure. This didn't just happen yesterday. The bug above just accelerates some of the replacements. Don't take my post out of context. I said, a vendor that is proven long term (by us). Not in general.
You can have a look on the left there .. under my avatar. I didn't just sign up here yesterday. I've been 12 years longer on this forum than you.