In the user preference of Wikipedia & other WMF Wikis one can set the thumbnail sizes to 120, 150, 180, 200, 220, 250 and 300 px. Default is currently 220 px and will be changed to 300 px within the next days. The maximum possible size will then be the default and it's no longer possible to increase the size.
The screen-sizes, screen-resolutions and bandwidths have increased in the past substantially and will likely continue to increase.
I suggest to add 350, 400, 480 and 500px and remove the options 150 & 180 px witch are nearly not used.
Note worth links:
- Statistic showing the uses to the available options:
- An old bug (2007) concerning this, witch was declined because of performance issues witch are not valid any more:
T13118: Allow larger/user-specified thumbnail sizes
T69703: Change MediaWiki default thumbnail size to 300px based on user behavior
T65440: Please offer larger image thumbnail sizes in Special:Preferences
T106640: Choose a sensible set of thumbnail sizes for Special:Preferences