Why Not to Use a Rip Saw Blade on a Miter Saw
You can't use a rip blade for on a miter saw because the design of a miter saw is such that wood lays across its blade path and not along it. For this reason, you will not use a miter saw for ripping. Rip blades typically have a tooth count of 24-30, which is why replacing the stock blade makes sense for most applications. Miter saws are powerful tools because they transcend regular carpentry jobs like cutting two-by-fours. They pass into the realm of fine woodworking — the device is sensitive enough to make furniture. Why remove its capabilities with a rough-cutting rip blade?
While a rip blade might move through the lumber quickly, that bit of time you save will be lost when you need to sand each end of your cut. A rip blade leaves a rough pattern of scoring on your wood that a finer blade will eliminate.