Even with plywood basses there can a lot of seasonal movement. We recently had a month of cold, dry air from the Interior which dropped our relative humidity from ~45% down to ~25% and the resident basses here all needed to have their bridges cranked upwards to make them playable.
Adjusters will definitely affect the sound but its worth it for the flexibility. Especially if you are a newer player, being able to hear and feel the difference between having your G string at 5, 6 or 7 mm is helpful.
You might also check the String Height Poll here:
String Height Poll