Excel has several UI quirks that date back decades. It's never been consistent with the rest of Office even. If Microsoft changed it the accountants would revolt.
What's stopping other trades from forming a similarly powerful lobby, like accountants seem to have?
Then there's all well-known bugs like floating point addition and locale-dependent function names and 1904 dates.
Conditional formatting accidentally pasting is all over the place.
Cut and paste is even better. If the cell to be cut is being referenced, the referencing cell can magically update to the place to paste to.
Selecting and copying the /content/ of a cell is a very normal copy and paste operation.