I can’t wrap my head around why anybody would defend Steinberg in this situation. HiDPI was a selling point in Cubase Pro 10; that and ARA was my reason to upgrade. And here in 10.5 - 18 month (give or take) later, it still doesn’t work reliably for production work. Same could be said for ARA; plenty of obvious bugs.
Steinberg has got to get their **** together, and stop selling these half baked features that never fully materializes. If you bought Cubase 10.0 to work in HiDPI on your 4k display laptop, you got suckered - plain and simple. The last update for that branch has been announced, so you’re straight out of luck! Simple 2:1 scaling for plugins would actually make it usable. As for the 100% / 200% only caveat: that was announced upon release … so … i guess thats more of a feature request. But seriously - you can’t sell something and never deliver; that’s illegal!
If HiDPI is useful or not shouldn’t really be part of the discussion IMHO. And - might i add - If this problem is unfixable in 18 month, something is either seriously wrong with the code - or much more likely - not a priority @ Steinberg.