2 answer expanded to include possible vignetting
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Other than the cost of the step up rings, the onlythere are two possible disadvantage is that yourdisadvantages:

1) The lens hood may not fit over the larger filter. This will vary according to the lens model and the type of hood it uses.

Because Canon names their lens hoods according to the size of the opening, you can easily tell if there might be a problem.

For example the Canon EF 85mm f/1.8 has a 58mm filter thread and uses the ET-65 lens hood. If you were to use a 67mm filter with a 58-67 step up ring, the ET-65 lens hood with it’s 65mm opening would not be able to be installed over the 67mm filter.

2) Ultra Wide-Angle lenses will be more prone to vignetting(darkening) in the corners.

Examlpe: Canon EF-S 10-18mm STM with 2 stacked step up rings (67-72 and 72-77) and a regular CPL, there is definite vignetting visible at 10mm.

If you were to use a single 67-77 step up ring and a Slim CPL you may not see any vignetting.

Other than the cost of the step up rings, the only possible disadvantage is that your lens hood may not fit over the larger filter. This will vary according to the lens model and the type of hood it uses.

Because Canon names their lens hoods according to the size of the opening, you can easily tell if there might be a problem.

For example the Canon EF 85mm f/1.8 has a 58mm filter thread and uses the ET-65 lens hood. If you were to use a 67mm filter with a 58-67 step up ring, the ET-65 lens hood with it’s 65mm opening would not be able to be installed over the 67mm filter.

Other than the cost of the step up rings, there are two possible disadvantages:

1) The lens hood may not fit over the larger filter. This will vary according to the lens model and the type of hood it uses.

Because Canon names their lens hoods according to the size of the opening, you can easily tell if there might be a problem.

For example the Canon EF 85mm f/1.8 has a 58mm filter thread and uses the ET-65 lens hood. If you were to use a 67mm filter with a 58-67 step up ring, the ET-65 lens hood with it’s 65mm opening would not be able to be installed over the 67mm filter.

2) Ultra Wide-Angle lenses will be more prone to vignetting(darkening) in the corners.

Examlpe: Canon EF-S 10-18mm STM with 2 stacked step up rings (67-72 and 72-77) and a regular CPL, there is definite vignetting visible at 10mm.

If you were to use a single 67-77 step up ring and a Slim CPL you may not see any vignetting.

1
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Other than the cost of the step up rings, the only possible disadvantage is that your lens hood may not fit over the larger filter. This will vary according to the lens model and the type of hood it uses.

Because Canon names their lens hoods according to the size of the opening, you can easily tell if there might be a problem.

For example the Canon EF 85mm f/1.8 has a 58mm filter thread and uses the ET-65 lens hood. If you were to use a 67mm filter with a 58-67 step up ring, the ET-65 lens hood with it’s 65mm opening would not be able to be installed over the 67mm filter.