This is a collection to keep track of possibly relevant ideas, which we should consider if we ever do a new style (likely not before 4.0).

• axhline, axvline should use the grid color by default axhline/axvline don't use prop_cycle #14222 (comment)
• Color blind-friendly default color cycle Color blind-friendly default color cycle #9460
• How to handle changes in styles? Update seaborn style #13680 (Update seaborn style)
• Marker sizes could be perceptually uniform Sizes of different markers are not perceptually uniform #15703
• Make 2D and 3D plots look more similar Inconsistent background & mesh for 2D and 3D graphs #20352
• Consider deactivating using offsets for tick labels by default. This is regularly confusing users, e.g. [Bug]: The plot is incorrect for certain data #23053.
• Let stem() take part in the colorcycle [ENH]: consistent behaviour for stem #23127.