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If you are working with unfamiliar data it is very useful to be able to view a huge number of rows in one go. It is the kind of tool that coders all have and use but is unavailable to the general public. Of course excel should be able to quickly scroll through millions of rows if that is what the user wants. Filtering maybe the next step but you need to feel out the data first to know what to filter.

Also, it makes a certain sense to over-engineer this kind of technology to give other elements of the stack some leeway. Lazy loading is great but so is pre-emptively loading data in case latency rises.