There are NO benefits in waiting to file the I-485...none. When you delay filing, you endanger yourself, delay working, delay being able to leave the US, delay applying for citizenship.
Just as others have said, ANY non-immigrant is out of status and subject to removal after the expiration of their I-94. I would do whatever it takes to get a PROPER I-485 filed prior to I-94 expiration.
A truly successful immigration process requires a lot of knowledge, planning, time, patience, and money.