I found that many helipads exist that are not surrounded by heliports.
(Example: Helipad without heliport, Example: Helipad surrounded by heliport)
The difference between the both is clear: They are like runway and aerodrome.
But: In many cases the extend of the helipad practically is the extend of the heliport itself. So should all helipads without surrounding heliport then be also tagged with aeroway=heliport
?