In my experience, yes, for the best results. If I changed my developer (or film), I would run my standard tests. These tell me the EI and contrast at different development times. It is true that the EI may not change much, but the tests are really for contrast, and the EI result comes 'for free'.(posted 9080 days ago)In case you are wondering, my standard test is simply to guess an EI, and photograph a grey card in Zones 0, 1, ... XV (or thereabouts), including half-zones. The densitometer then tells me the correction for EI, and the contrast. One roll of film per development time. This also gives me information about any shoulder, toe shape, and grain.
The test would use less film if I photographed a step-wedge, but I find that rather awkward.