Revisiting strong-coupling determinations from $e^{+}{e}^{-}$ event shapes

We reassess the theoretical uncertainties of strong-coupling determinations from a global fit to the $e^{+}{e}^{-}$ thrust data, focusing in particular on the scheme dependence associated with the applied renormalon-cancellation prescription and on the choice of scale parameters that are used to estimate higher-order perturbative corrections in all sectors of the calculation.