When there is scientific evidence of harm then substances should be restricted & those wishing to use them should need to prove they are not harmful.
An Australian systematic literature review of 221 publications through 2017 shows there is harm in varying levels.
1) higher blood cholesterol levels responsible for heart disease
2) higher Uric acid levels reducing kidney function
3) higher incidence of kidney & testicular cancer
A Nordic Council of Ministers analysis of PFAS exposure also concludes higher incidence of kidney cancer.