It’s not critical, but it keeps things clean, keeps salt/snow off in winter, and contributes to fuel economy and ride quality.

Stretching an oil change is a bigger concern, especially if the oil change interval is a long one. Learn to do it yourself, it’s really simple and depending on the car you may be able to do it without ramps or a jack if you’re creative in parking eg over a dip or one wheel (securely) on a curb. Ensure you don’t spill oil into a drain.