Each to their own, but I find it a seriously useful tool, especially with 6k as it extends the focal length of my lenses by up to around 2x.
This allows me to use shorter and lighter lenses which are also cheaper to buy in the first place such as a pair of Lumix 20-60mm’s which I can easily get over 100mm of reach with in post.
Arguably, you can crop any footage, but 6k has an advantage over 4k as 8k does over 6k, but sweet spots and all that…
Same approach for me with stills these days as in using a higher megapixel camera as it allows me to use less hardware which means a lighter load and more flexibility from less kit, albeit at the expense of some storage, but that in itself is much cheaper than extra bodies and lenses etc.