Show and Edit Dimensions of selected Vertexes/Edges/Faces in Edit Mode

Hello, I am new in blender and missing the possibility to edit the size of selected vertexes, you can edit the position of the bunch of vertexes in the transform palete, but not the size. in my opinion the size is as important as the position. and I think that the implementation of this is very easy.

there is an addon, edit dimensions. github.com/ekaj2/MeshTools

That solves this problem, but I think it have to be a part of the software and always in sight. that is not only a tool to change your model, but also to read your model, I always select and check the position(and size) of points to be sure, that I am on the right way.

i made this screenshot and edited it to show how I think it should be. The pink-box is added by me.

thank blender