Mayonnaise is mostly oil and egg, which is kind of more akin to carbonara than Alfredo. That said, it has a sourness that isn’t going to mesh the same way-- basically, vinegar and/or lemon juice, which one generally wouldn’t want much of (if at all) in something meant to be creamy. Main reason I don’t particularly like it as a butter substitute in grilled cheese.
Knowing what goes into things like mayo, ketchup, Sriracha, etc, can work well when you’re in a pinch, though. It’s just harder to control the ratio of sugars, salts, and sour components so you have to offset that elsewhere.
Mayonnaise is mostly oil and egg, which is kind of more akin to carbonara than Alfredo. That said, it has a sourness that isn’t going to mesh the same way-- basically, vinegar and/or lemon juice, which one generally wouldn’t want much of (if at all) in something meant to be creamy. Main reason I don’t particularly like it as a butter substitute in grilled cheese.
Knowing what goes into things like mayo, ketchup, Sriracha, etc, can work well when you’re in a pinch, though. It’s just harder to control the ratio of sugars, salts, and sour components so you have to offset that elsewhere.