I would really like to see a PlotTheme "Engineering." Engineers often use graphs for more than publication: as working documents for design, and to read values from them.
I suggest the following:
1) Plots are framed.
2) PlotLegends are available.
3) For linear axes, ticks and grid lines are as usual.
4) For log axes:
a) Major ticks and grid lines if automatic are always on the decades.
b) If there is room, minor ticks and grid lines are drawn on the usual 1 through 9 sub-decade divisions.
c) 1 through 9 subdivisions are NEVER spread across more than a decade. If there isn't room to place them in each decade, then they should not be drawn.
d) Major divisions are labeled with the appropriate 10^n label, but if it becomes crowded these labels may be reduced to a fraction of the major divisions. But major divisions always occur at each decade regardless.
I think such plots would be useful for many engineers.
Best regards, David