The most demanding items can make a quick programme unsuitable for the mixed load. A lightly worn shirt and heavily soiled work clothing need not have the same washing requirements even if their colours match.
Understanding this situation
Quick cycles are generally intended for a stated load and level of soiling, so adding difficult stains can produce a disappointing result without a failure in the washer. Extra detergent alone does not provide the missing programme time or the correct textile treatment. The care labels still limit what can be selected.
A useful next step
Sort by compatible care and cleaning needs, not just by how urgently the clothes are wanted. Pretreat only as the garment and product instructions allow, and use a suitable cycle for the more demanding items. When reporting poor results, explain which soil remained and which programme was used; those details distinguish expectations from a new appliance change.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.