Having said all that, it still makes sense to me, for the most part. I watched a lot of tutorials when I learned it back in the day, however.
I tried making an SVG manually, using real basic integer coordinates.
Then I wondered if inkscape could do better, and imported it.
It took my nice shapes, like a rectangle from 0,0 to 50,100 and mangled all the coordinates into floating point numbers like 0.0123,0.00456 49.9998,100.00123 (not exactly, but you get the idea)
You have to be careful about when you move, scale, group, ungroup, etc. But I have found it pretty reasonable to stay on nice round numbers with inkscape. I feel like inkspace is BETTER for that than say illustrator.
Worst case you can export as "Optimized SVG" and reduce the number of decimals. Make sure you check it after though since it can change the design when rounding.
Consequently, I find it impossible to do precise CAD style diagrams in Inkscape. Of course, it's not designed for that.
I don't know exactly when/which version, but some time in the last 12-18 months.