In the end it's a personal preference whether you want to get busy for a certain period to then be able to relax a bit more, at least until you have to top up with high TA fill water again. Or just keep adding what's required. Unless your CH and the water temperature is that high that you can control CSI only by forcing TA down - in this case you have to do it, otherwise it's a choice. The aeration can then also have the side effect of cooling your water, which also helps to keep CSI down.
So now that I have a little more time now-- I will address it. Since I see you are from Australia, most other places in the world have soft water compared to most of the US. Melbourne's municipal supply has 10-26 mg/L CACO3?!? That is what Google says? I'd LOVE to have that even for my beer brewing water! Nowhere in the US is water that soft... even in soft areas like Florida.
I get 11 PPM TDS out of my RO system total! So you have almost pure water there. We have about 250 PPM CACO3 (10 to 20 times as much!) and another 300 PPM of "other minerals", our pH is about 7.6 and my fill TA in the winter is about 130 and in the summer 180. It is worse than that in Phoenix. We are higher in elevation, cooler and much wetter than Phoenix. Because of that their water is worse in all respects. They also mix in Colorado River water which by the time it gets this far south has picked up a lot of hardness from the canals.
I had about 300 PPM CaCO3 hardness in the Midwest but the TDS level was about 300 PPM total...
So it's a completely different ballgame here than in Europe or Australia apparently.
Now you are in a hot desert as well, but maybe you aren't allowed to have these-- pools here have float valve driven autofill lines. I can turn the valve off to it, but I can't see a good reason to do that. In Tucson, water loss during the summer (and it's peak heat now and almost peak dryness) is about an inch and a half a day (cover off). That's about 3.75 cm a day water loss. This is why pools have something to refill them as standard.. it could only take a few days to get below the tile line and start damaging the plaster!
There isn't a service in the US that you could hire that will do maintenance to a pool more than once a week, either. Not that I know of. So almost every pool here is taken care of only once a week.
So.. we do have a different situation here from you... considerably. I could probably run any sort of CSI level with 20 PPM CH and never have a cell scale up! I don't think I'd do a plaster pool there either because I'd want to use that water to my advantage, but at the rate of your fill water increasing CH? It would take 20x longer to have it cause a refill from CH issues... Literally the damage we get in a year to the water from evap and refill would take at least 15 years there.
As for aerating and cooling the water.. it's quite effective to do this here for temperature and I have a couple of times, but it also causes scaling at the evaporation line from the local area having the CSI increase when it is done, uses a LOT of water and raises CH, TA and pH because of the large amount of evaporation. I try to limit doing that. And with the floor system, I really have poor options for aeration, if I need to get serious about it (and I may) I might have to build something to go into a return (which I have to turn on) to do it for me. I can really only aim the returns upwards now and turn them on, or use the silcox on the pump through a garden hose back into the pool. This actually works better..
One thought I have had in addition to running a soft water line to the fill (which is about $2000 and rip out the drywall affair) is to design some sort of acid auto doser to the fill. I won't give details of my thoughts.. maybe I'll patent it. It's a freaking good idea.
But I keep hearing that SWCG's are pH and chlorine neutral but in my case and the couple of others I know that have them locally that isn't the case. I don't believe it.