Thanks Ashiepoo,
It is not my concern what the professors would think, since I have a strong relationship with them and at least three of them would not really mind I chose not to waive my right to access them, in fact, two of my professors sent me the letters before submitting them to approve them if I want.
What really matters is whether or not not waiving my right to review LOR would affect the admission committee decision and if would make those strong letters of less value.