Incorrect. The turning signal is called an Indicator, because it give other drivers an indication of your intentions. So you first look and check that it's possible and likely safe to merge. Then you indicate your intention. You then merge if/when safe.
Indicating an intention to merge into a narrow gap is fine - as long as you only merge when there is sufficient room to do so.
But if the car beeps at you just because you indicated - then there is a design issue.
> If they opt to make room for you, great (that's just courteous driving), but it's not an obligation.
Absolutely - I was not implying it was an obligation. I am only saying that you use your indication to indicate to other drivers your intention. It is totally valid to turn off your indicator and not merge after indicating.