CorellianComedian wrote:So it’s the opposite of how Replaces Turn works, right? You can’t use a “Replaces Turn” ability unless you have a turn to replace, but “Replaces Attacks” abilities are used in an “attack phase” that you are entitled to whether or not you are able to attack?
I don't think that counts as 'opposite', but you described 'replaces turn' and 'replaces attacks' correctly.
The ruling regarding a distinction between attacks and non-attacks that replace attacks - that ruling goes back to WotC days. The T1 Series Bulk Loader Droid has Heavy Weapon, which restricts attacks. That droid cannot both move and attack, but it can move and use Heavy Lift (a replaces-attacks ability).
There may be confusion because Mobile Attack and Greater Mobile Attack apply to both attacks and abilities that replace attacks. However, it is specified in the glossaries that those abilities also apply to replace-attacks abilities. By default, they are different categories.