30+ years ago there was a lot less consideration of slope, soil type and the settling tanks were smaller. Shorefront systems never failed, they just leached into the lake. The OP doesn't say seasonal, STR or year round use. Short term renters who are on a sewer at home may dump all sorts of things into the system. There are designers, inspectors and builder/installers. There is a temptation to think that somebody who "does it all" may do it all to you, while different perspectives from different contractors may be a better solution.
Flushing dye through the system may sound like a good idea, but it is unlikely to be definitive if the system isn't being used routinely.
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