What a good solution does
A useful waterproofing plan either stops water at a specific place water enters, reduces water reaching the foundation, or collects and redirects groundwater before it enters the living space. The method should have a clear relationship to the observed problem.
When simpler work may help
Some basement-water problems are made worse by overflowing gutters, short downspouts, poor grading, or a failing sump pump. Those issues should not be ignored just because a waterproofing system is available.
Wisconsin consumer guidance
The Wisconsin Department of Agriculture, Trade and Consumer Protection specifically notes that expensive waterproofing is not always the answer and requires sellers to provide an analysis of the water problem and proposed methods/materials before finalizing a contract.
Homeowner reference: Wisconsin DATCP basement waterproofing guidance.