I am a strong supporter and user of VarAC which I believe to be the right solution at the right time.
I have been a user of conversations digital modes like Olivia for a long time. As a retired electronics engineer, I am particularly attracted to the intersection of personal computers and radio which has drawn me to digital modes and SDR radios.
Many of my VarAC QSOs have been with first timers and/or younger hams. Many are FT-8 users looking for more than a log entry.
Using other digital modes can be challenging for new users. What mode am I hearing? What mode should I use to make a contact? What frequency should I use? VarAC takes away a lot of the guesswork and answers all of those questions.
Using a single calling frequency per band is a key feature but care must be taken to protect that frequency. Adding the automatic QSY after CQ feature in the last release is an excellent example of addressing this issue.
I suggest a modification to the beacon procedure for two reasons. First, as the use of VarAC continues to gain momentum, repetitive beacons will make finding an opening on the calling frequency more challenging. If you do the math, the number of beacons sent with a 15 minute repetition to completely block the calling frequency is not a large number. Second, HF propagation changes rapidly. Posted results of a beacon sent in the past don't indicate current propagation.
Sorry for the long setup to a very simple suggestion. Remove the repetitive option for a beacon. Allow only one beacon to be manually triggered.