are you sure?
Assuming that we differentiate between taxi weight and take-off weight as a given. There is presumably a mother of all weights that can never be exceeded for take-off, regardless. And then there will be a maximum permissible dependent on the actual conditions. Whichever set of regulations is in force there would surely have to be a recognition that maximum permissible and all-out maximum are likely to differ and the former can never exceed the latter?