AutoCAD has been around for a long time. AutoCAD users that worked with versions before AutoCAD 2008 and wanted to place dimensions in model space were constantly changing the dimscale system variable to make their plotted dimensions legibly with different plot scales. If you were placing all your dimensions in paper space you did not face the dimscale issue. For those that do place dimensions in model space, normally inside the viewport, you can forget about bothering with the dimscale every again. Annotative scaling will automatically maintain the correct scale of dimensional objects including text, arrowheads and other symbols when the drawing scale changes.
Annotative dimensional styles can be identified by the small icon that looks like the end of an architects scale. It is set under the "Fit" tab of the dimension styles dialog.
My dimension text height is 1/8". If I check the dimension text height in the paper space viewport, it is 1/8". Annotative scale does not apply to paper space annotations. If I check the dimension text height in the paper space viewport that was dimensioned through the viewport in model space, I find that the dimension elements have all been scaled eight times larger. The dimension text height is 1" (8 x 1/8").
If I change to scale of the viewport to 1:10, the dimension elements are scaled up accordingly with the dimension text height changing to 1.25" (10 x 1/8") all automatically. When plotted to scale, the text size will all be 1/8".
Annotative scale can be applied to text, blocks, hatches and multileaders. So forget worrying about dimscale, create annotative dimension scales and let AutoCAD do the work.