>>1679973they didn't mention using a tension meter either, for truing an old wheel. It seemed like you couldn't really afford to be too fussy about spoke tension otherwise it would be impossible to even get it true, radially or laterally. It was a variable to keep in mind but only to avoid extremes which are quite obvious without a finer tool.
I can definately see the use for building a new wheel though, where you aren't correcting for bullshit. The bullshit seemed like a fifth variable which means you can't really address spoke tension in any precise way.