Standover height is not key, but for a tourer, getting the handlbars high enough is. A high bar requires either lots of stacked spacers, an angled stem, a long (quill) stem, a big frame (high standover and long seat tube), or a long head tube with a sloped top tube.

So standover can be an indication of fit. More imortant are getting your butt the right distance back from the BB and as I said, handlebars at the right height and reach.