What you're describing with long-term weight regain is completely typical. Nearly everyone who sheds pounds through diet and exercise alone ends up putting it back on eventually. My take is that once the system governing appetite and weight regulation takes damage, it rarely fully bounces back for most people, especially with more severe cases, so holding onto the loss ends up requiring eating below what would normally be needed thanks to metabolic adaptation, on top of dealing with amplified hunger from the weight loss itself. That combination is nearly impossible to fight through long term, and hardly anyone manages it.
Medications in this class are by far the most effective tool that's ever existed for this exact problem, with bariatric surgery being the one possible exception, even more effective but with its own tradeoffs.
So the smart play is beginning one of these compounds and continuing it indefinitely after the weight drops, which really means you'd only need to go through the loss phase this one final time. And yes, treating it as a crutch is completely fine, that's exactly what it's designed for, ongoing management of a serious weight condition. Frame the whole thing like a temporary diet-and-exercise program with a finish line, and odds go way up that it eventually falls apart, since demanding constant willpower to eat less or keep exercising just wears people down until they quit.