Slow speed maneuvering is a challenge for many boat operators. Single engine boats generally have less slow speed control than twin engine boats. A single engine boat really has no tool other than aggressive driving to counter the feeling of “losing” the bow in crosswinds, not to mention steering while reversing. While a twin engine boat is more controllable, it is by no means simple to handle in tight spots. It takes skill and training to become proficient at docking a boat without a thruster.
While installing a thruster may be a larger investment than some other accessories (like electronics), the upside is that it adds more long term value to the boat because it does not go out of fashion or is likely to ever need replacement.