Notation alone maybe not but O(n) just like you write needs to be addressed. Users or stakeholders expect that they can get "all data" loaded with one click and

Notation alone maybe not but O(n) just like you write needs to be addressed. Users or stakeholders expect that they can get "all data" loaded with one click and it should always be instant. With N getting bigger just like you write UX or workflow often has to be changed to have data partitioning even if it O(n) - like adding pagination, moving crunching statistics to OLAP. It quickly gets worse when you have database joins and you might have to understand what database does because you can also have O(n^2) queries then even if db engines are insanely fast and optimized on their own knowing what query does like full table scans also can kill performance.