Haha, well I think you'd get some get some indignation from folks with "normal" scopes that their units were "somewhat inferior"
However, yes, any system which involves ground loops, particularly where that loop path passes through mains ground is subject to issues. Audio systems, for instance, tend to suffer from hum problems if audio ground connects to mains ground in both 'sources' and amplifiers. What it does mean is that you need to always take ground loops into account when measuring - one of the reasons why many Bench PSUs have floating output and separate mains ground terminal. The ideal is to have the 'system' reference to mains ground at a single point, often not possible in the real world with several pieces of grounded test equipment and debugging on a piece of equipment that is also mains ground referenced. Not a show stopper, but something certainly to be aware of.
The problem is particularly bad with USB instruments though. Computer USB ports are fairly fragile, the USB spec specifies that the outer braid and connector shells should only be grounded at the PC end so, for instruments that follow the spec, the only ground return path is the little black wire in the USB cable. In fault situations where significant current flows through the earth clip, the black wire fries, followed almost instantly by the USB 5V and data signals! It also means that noise levels can be higher than integrated bench type scopes. That makes the USB isolation in the Owon (I) versions highly desirable, as far as I'm aware they are the only low cost USB scopes that can do this, Hanteks (not sure about the Siglent Analog discovery products I haven't looked into them) and the like like rely on lots of USB bandwidth - beyond the reach of current USB isolator chips.
Sorry, I'm rambling a bit. In terms of noise, it isn't too critical for an 8 bit scope like the VDS1022(I), but the isolation does give some benefit and most importantly in protecting the PC from damage. Any situation where a low voltage low impedance current could potentially flow through the ground loop will benefit from isolation.
Once you get into the realms of sensitive or precision measurements are involved, then various measures become applicable, I mentioned single point system grounding, there are also differential probes for common mode rejection, decent bench meters have floating inputs with a separate guard terminal, both screened from mains ground, etc.
Thanks for flagging the bug in the 1.0.29 S/W it adds to the group inteligence in lieu of release notes! - Owon do seem pretty accident prone. You may have seen a few posts back, that I uploaded my collection of previous S/W versions (I see it still has a week to run). If you have any problems with 1.0.28, then I used 1.0.23 for a long time without noticing any issues...
https://uploadfiles.io/70a4d (appropriate virus check cautions apply!).