Yes, you only see the reference line hotspot - unless you go into EDIT mode.
But of course, then you can't add dimensions.
Any dimensions you do add though, should be associative.
I just tried on a beam with modifiers and my dimension stretched as well as I changed the beam.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10