Making tube artillery isn’t hard (compared to say, modern radar systems or nightvision gear), and they can just keep making more.

ehhh.... harder than you think. there's a lot of metallurgy involved with the forging, requiring chromium they have to import (chromed barrels last MUCH longer, 2-3 times more rounds per tube). Then once you have a barrel blank, you have a very tight precision dance of taking that blank and boring out the tube, breech and other complex bits - these processes take time and more importantly, western sourced equipment that hasn't been replaced since the early 2010s. If you half ass it the barrel explodes, so it's a touchy bit of work. https://en.defence-ua.com/industries/artillery_barrel_production_in_russia_structure_importance_and_weak_points-12151.html

the fact that they're fielding north korean arty in ukraine tells me whatever stores they had must be running low, because how else do you justify moving self propelled guns from manchuria to europe? https://www.newsweek.com/ukraine-destroys-fifth-north-korean-artillery-system-one-month-2050575

edit: some of these that got popped yesterday !

https://bsky.app/profile/specialkhersoncat.bsky.social/post/3m22txhlyzk2o

And that’s kind of a big problem for a military that has spent the last century basically centered around massed tube artillery and tanks.

this is a very good point, RU has traditionally leaned really hard on the massed artillery aspect of warfare and that isn't going to be as easy an option moving forward