I have being using a 2D42 on my bench for some hobby grade stuff, things like microcontrollers and basic analog circuits and I would not call it junk, instead prefer to say that it is just a basic tool so, people who need it for more advanced stuff might find it some what limiting.
I also have a Rigol DS1054Z as my main oscilloscope but many times I find the Hantek2d42 very practical to just quickly check a signal on a board I am working and I like the fact that I can easily change between scope and DMM function.
I agree that the screen is a bit small and that you might need some time to get used to the controls but i think it is just a trade off of a device that was intended to be portable an cheap. I also don't know an option that will battery powered, packed with functions and cheap at the same time.
I spotted this little scope on Aliexpress another day:
https://www.aliexpress.com/item/33021370646.html?spm=a2g0s.9042311.0.0.46064c4dYIVz1v I haven't tried it, but the specs looks interesting although the display is the same size as the Hantek's, it has only one channel and looks more a toy. There was a thread about it here in the forum a few days ago.
Regarding the VDS1022, you can try the app HSscope for Android
http://hscope.martinloren.com/ if your tablet is compatible with USB OTG.