It is accepted that the results following rhinoplasty will take about 1 year to settle. This is why we all suggest to wait as long as possible before going ahead with a revision surgery to the nose.
There are certainly some exceptions and if you trust your surgeon then you should be patient and follow his advice.
Though it is still too early for a general nose revision, I believe your surgeon feels that the causative parts at the tip are not the things that would resolve with time such as residual cartilaginous hump (responsible for supratip swelling or polly beak), tip soft tissue, tip cartilage, and thick skin.
I would rather respect his opinion, otherwise wait for 3-6 more months.
Usually we recommend waiting a year before revision rhinoplasty. Even though it appears swelling has resolved there is still induration and some swelling at the surgical site. This will lead to a higher probability of not reaching your aesthetic goal if operated on too soon. Donald R. Nunn MD Atlanta Plastic Surgeon.
This is not common at 3 months. It takes weeks to months for the swelling to settle down after a Rhinoplasty. If you should decide to get a second opinion, be sure to take a copy of your operative report with you, as the new surgeon will need to see what was done in the first surgery. Best wishes!
No it is not the routine thing to do. That said though one really needs to review your preoperative photos, the operative note and do a full examination before stating categorically that it should not be done