Several of us already responded to this poster here on the Parents of the HS Class of 2026 thread and referred her to serviceacademyforums.com for specific USAFA questions.
Definitely. If a candidate does not seek alternate routes to service, they will be asked why not when interviewing with the nomination panels for that academy. They want to see a strong desire to serve not a desire to attend a service academy.
ETA: If a candidate applies to only one academy, they will also be asked to defend that singularity, again because most successful candidates apply to multiple commissioning sources indicating their willingness to serve their country in any capacity. It is important that anyone applying to a service academy understand that they will serve at the needs of the branch (regardless of their major or interest), so any candidate who expresses any type of service limitation (medicine, aviation, cyber, etc.) is not going to gain any points with the nomination panels.