Currently the h4, h5, and h6 headers are all styled with the same size and weight and subsequent apparent importance, despite being used on the page to designate a hierarchy of sections. As a result, h4-h6 sections can appear as though they belong to the wrong parent section, confusing readers.
'Product Management' is a subset of 'Product', but due to the skin formatting there is no way to tell when using Vector.
T65844: h3 should not be more prominent than h2 headings
T71998: Vector: h3 should not appear as heavier weight than h2
T71999: MonoBook: h3 should not appear as heavier weight than h2
T73240: Re-evaluate serif font stack for headers
https://gerrit.wikimedia.org/r/164712 (mediawiki/skins/Vector) Adjust header sizes to scale apparent size according to header weight"
https://gerrit.wikimedia.org/r/162304 (mediawiki/skins/Vector) Make h1-6 sizes consistently different"