It much depends upon performance legislation, i.e. the State in which the aircraft is registered and compliance with the local authority. For example, the UK TriStar (RIP), had flight manoeuvre limits of 15 degrees of bank, whereas in the USA (for an FAA registered aeroplane) the limit was 30 degrees of bank. Min Manoeuvre speeds for retracting the flap are predicated upon the bank angle, hence, should there be an engine failure after take-off you're within the speed bracket; erring upon the safe side.