The continuum limit is one of the main sources of uncertainty in
many lattice works. Recent works on the asymptotic form of lattice
cutoff effects by Husung et.
al. have pointed to complicated functional forms,
making difficult in practice the extrapolation to the continuum limit.
Simulations at fine lattice spacings remain a challenge due to large
autocorrelations, specially if topology freezing is an issue.
In this proceedings contributions we test the continuum limit of
Yang-Mills using different gauge actions.
We discuss how scales derived from the gradient flow should be used
for this purpose, and
argue that such tests of universality are needed in full QCD in
order to get confidence on current Lattice QCD results.