In this case, you may well have multiple floating view ports on a layout. If you are an Engineer, it’s likely that your drawings will contain a great many more orthographic views. Because there is only one view port per layout, you only have one place to check and see that you’re dims are OK. The size and position of the view port isn’t likely to change over the duration of the job, so you can dimension in paper space with confidence that your dimension won’t become un-associated by moving the view port around. Characteristically, architectural drawings involve many Xref’s compiled in model space, with just one floating view port per layout. If you are an Architect, dimensioning in paper space might work out just peachy.
