Depends on who those people are. As for the second question, it partly depends on which playback standards your trying to reach because it will have a say so in setting up your workflow. Live, Film, TV, Radio, Web, Cellphone, etc. Confusion is abundant in the music industry because compared to film, the music industry lacks a universal standard, well, that’s my current understanding.
Personally I’ve been using Loudness Meters with true peak levels (dBTP). For a complete read, check out http://tech.ebu.ch/loudness (Documentations on the right)
Loudness Meter I’m currently using: http://www.toneboosters.com/tb-ebuloudness/
I found the price approachable for my budget. As far as its accuracy, to be honest, I’m not that knowledgeable in this subject to make further ill advised comments. There are other Loudness Meter Vst’s but not a whole lot. I mentioned accuracy because the documents above mention something about gating methods for measurement…
Free Loudness Meter: https://www.audiocation.de/plugin (AC-R128)
Shows a slightly lower reading than the above meter, possibly because of gating method ?
Something I posted earlier, which is just a collection of Loudness Meter YT videos: https://forum.renoise.com/t/metering-porn/31953