As for your example, it was already fairly near the top, and the reason for the edit was primarily to remove dozens of single-character MathJax calls. They look ugly (they're italicized by default which clashes with the rest of the text), and are are slow.
More to your question, 600V isn't that bad, but 1µA, 1MΩ are worse. I'm not liable to bump a question to fix one or two, but if I stumble across a question which has several formatting issues, it's likely. Deciding whether or not to edit a post involves many factors, chief among which is the do-I-feel-like-it factor.
If you're asking my opinion about how posts should be written ("if I was king"), there should be a space between numbers and units as per the standard you site as well as NIST (see #10 on the checklist, or below) and SI. If it's in reference to some sort of nominal value (a 12-V car battery, 5-V logic), I think there is some other method for that but I am not sure.
NIST Special Publication 811 2008 Edition
Guide for the Use of the International System of Units (SI)
7 Rules and Style Conventions for Expressing Values of Quantities
7.2 Space between numerical value and unit symbol
In the expression for the value of a quantity, the unit symbol is placed after the numerical value and a space is left between the numerical value and the unit symbol.
The only exceptions to this rule are for the unit symbols for degree, minute, and second for plane angle: °, ', and ", respectively (see Table 6), in which case no space is left between the numerical value and the unit symbol.
Example: α = 30°22'8"
Note: α is a quantity symbol for plane angle.
This rule means that:
- The symbol °C for the degree Celsius is preceded by a space when one expresses the values of Celsius temperatures.
- Example: t = 30.2 °C but not: t = 30.2°C or t = 30.2° C
- Even when the value of a quantity is used as an adjective, a space is left between the numerical value and the unit symbol. (This rule recognizes that unit symbols are not like ordinary words or abbreviations but are mathematical entities, and that the value of a quantity should be expressed in a way that is as independent of language as possible—sees Secs. 7.6 and 7.10.3.)
- a 1 m end gauge but not: a 1-m end gauge
- a 10 kΩ resistor but not: a 10-kΩ resistor
However, if there is any ambiguity, the words should be rearranged accordingly. For example, the statement “the samples were placed in 22 mL vials” should be replaced with the statement “the samples were placed in vials of volume 22 mL.”
Note: When unit names are spelled out, the normal rules of English apply. Thus, for example, “a roll of 35-millimeter film” is acceptable (see Sec. 7.6, note 3).