It's not a silly question, it could have be nice to have handles on a Ctrl+A (in few cases only) 
Ctrl+A = "Select All" and is not dependent of the selected tool, thus the feeling that Ctrl+A = "Select All + Enter"
Ctrl+A works on all your Windows OS (Linux it's the same, Mac is similar witth CMD+A), it works on/in your folders, it works in your browser, it works pretty much everywhere on any-app with the very same behaviour.
Next is pure allegation, I'm no programmer ➤ So it's (maybe) a mitigation to behave that way as it's also an operating system command, and people will expect to behave that way. But I'm more whiling to believe it's taken directly from the OS or desktop environment like the Ctrl+X/C/V.
Ctrl+A = "Select All" and is not dependent of the selected tool, thus the feeling that Ctrl+A = "Select All + Enter"
Ctrl+A works on all your Windows OS (Linux it's the same, Mac is similar witth CMD+A), it works on/in your folders, it works in your browser, it works pretty much everywhere on any-app with the very same behaviour.
Next is pure allegation, I'm no programmer ➤ So it's (maybe) a mitigation to behave that way as it's also an operating system command, and people will expect to behave that way. But I'm more whiling to believe it's taken directly from the OS or desktop environment like the Ctrl+X/C/V.