Pro

This is a bit misguided. If you lose weight too fast, you will have tons of side effects no matter how safe the medication is. Your heart, kidney, pancreas can be stressed with too fast weight loss even without meds. Also you might end up with a lot of loose skin...

Also a new medication will have unknown long term side effects for sure that will surface over time, similar to the current ones.

In my case mounjaro was life changing (for the better). I would say 42kg over 15 months was fast enough already.

In regards to obesity and fat loss, smooth, consistent weight loss is essentially always preferable to rapid weight loss - both from a whole health standpoint, and from a durability-of-effect standpoint - and sooner is always better than later.

IMO, the ideal way to use these is as an enabler or multiplier for a healthy lifestyle. Using GLP-1-family drugs to enable an unhealthy lifestyle is always going to work out worse for everyone than using them as an adjunct to disciplined diet, regular exercise, and good sleep.