Why does one have to hit enter after typing one's Windows password to log in, while it's not to hit enter after typing one's PIN?

I've noticed that on Windows 10, one has to hit enter after typing one's Windows password to log in, while it's not to hit enter after typing one's PIN. Is there a security reason to it?

Typing one's Windows PIN to log in:



Typing one's Windows password to log in:



It’s a simple matter of usability.

For PINs with a fixed length, such as 4-digits, the PIN is automatically submitted when it reaches said set length.

Your system doesn’t know your password’s length, however, so it’s up to you to manually submit it (with enter or similar).