Do you still recommend going to the gym when the person doesn't need to lose weight?

Yes to maintain ideal weight stability

Yes, definitely. There are many other benefits of going to the gym such as: Improving bode density, Improving cardiac health, Reducing stress levels, Improving self confidence And many others

yes inorder to mantain body weight

Exercising isn’t always about losing weight. If getting in shape without losing weight is the goal, it’s important to know which rules of exercise and dieting you should follow. According to the American Council on Exercise, muscle building exercise programs with proper intake of protein, carbohydrates and healthy fats can lead to muscle gain and fat burning without significant loss of weight. Exercising to maintain current weight requires a program that focuses more on building muscle and less on burning excess calories. Exercise programs that work for this type of goal include strength training and mass building. Fewer repetitions per set -- typically six to eight -- will increase strength and build muscle without burning more calories than you need. Training harder and less frequently is also a good strategy for getting in shape without losing weight since you will rest more often. Cardio should be kept to a minimum in order to preserve calories that your muscle will surely use up as you build lean mass. Too much cardio will speed up the weight loss. Stick to shorter and more intense cardio sessions, such as interval training or speed drills. Interval training will help burn fat, but help you keep lean muscle, according to the American College of Sports Medicine.

You don't necessarily need to go to the gym. If you were able to learn simple exercise that you can reproduce at home in order to maintain your shape. It's highly recommend that you keep doing a physical activity. Studies have shown all the benefits of being active sush as reducing obesity, morbidity..

definitely YES it keeps you fit

Sure, you always need to go gym with and without need to lose weight :)