What makes "Nobel prize winner" so special that we need an entity for that. We have thousands and thousands of awards, the recipients of these awards deserve in equal measure to be recognised. There are many other awards like the UN Environment Programme awards that are not even in Wikidata.
Yes, we could do with more structure, we even need it. The biggest problem we face is the lack of a conversation about quality. It allows !@#$% to delete data from Wikidata because of what THEIR Wikipedia has determined to be the gospel truth. It is why some !@#$ delete content because their fetish with references. I am quite happy to add references by the way, it just does not make sense to approach this on an item by item basis.
I also find that I am spending more time on merging and massaging data. The most important part is that even though a merged item has a better quality, either perspective on an item was of value.