[Littlemaster]

I am one of the devotee of the default theme which comes up with MyBB.May be because it was maintained by all of those who work behind the script rather than a specific theme maker this theme fit almost all the devices.
Most of the custom made themes have issues with some devices.

The logo is not updated for this theme.
https://post4vps.com/images/logo.png
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[antix]

i dont think that the goal of the default theme is to be used by users ..

i think they aim to give the designers the borders which they can work on to make their themes ..

though actually there is no borders in design but you know what i mean

[Sagnik]

Default theme should not be always used...yes that's a different matter that images are not updated..
also https://post4vps.com/images/logo.png can't be replaced with the current logo https://post4vps.com/images/square/logo.png
As it a completely white logo with transparency