Potential benefits, not universal promises
In some projects, polyethylene may help reduce mass, integrate complex shapes or lower the number of components. The result nevertheless depends on the material grade, geometry, wall thicknesses, process and actual use.
Chemical resistance, impact behaviour and service life must not be generalised either: they must be considered in relation to the substance, temperature, exposure and loads.
The useful question
Rather than asking whether the material is ‘better’ in absolute terms, it is more useful to establish which requirements the product must meet and which trade-offs are acceptable for the project.