In general, it is not financially advantageous to extend a lease.
In a lease, you are financing depreciation.
If your payment matched the actual depreciation curve, your monthly payment would be huge at the beginning and be much smaller at the end.
Your lease payment doesn’t do that, it’s the same every month.
What that means is that you are underpaying for depreciation at the beginning of your lease and overpaying for depreciation at the end of you lease so it balances out.
Extending your lease only means you are spending more time in the over payment zone.
I said “in general” above because of course, there are exceptions.
Maybe the current lease programs/incentives are really crappy, you are waiting for your ordered car, or you’re going out of town and don’t need a car for a couple of months so it’s better not to be in another lease at that time.