I highly doubt any Internal combustion engined vehicle charging system is Ideal for any battery, especially if the battery were deeply discharged.
One can try and rule out some batteries if they say want no more than 14.5v and their vehicle will do 14.9v, but there is no perfect charging system in a vehicle.
The vehicle manufacturers are more concerned that they do not overcharge a battery. Making sure the charging system perfectly recharges a battery to full for a maximum lifespan, from any state of charge, is hardly a priority for them.
Those that run their battery dead, and expect the alternator to quickly and fully recharge it after a jumpstart are seriously misinformed and deluded.
Even if the battery was removed from the vehicle and used with a specified charger of the correct currents and voltages for a particular battery, guess what, the manufacturers are continuously updating their perfect charging algorithms. A century old technology which is still being tweaked.
No alternator is going to do a perfect job on any battery. Far too many people act like the alternator is indeed a magical battery restorer, when in fact it does a poor job at returning a depleted battery back to 100%, and the lead acid battery, flooded/AGM or Gel, which gets to live its life closest to 100%, will last the longest.
Despite this fact, batteries can still live long lives, despite not being perfectly recharged according to the ever changing manufacturer recommendations.
AGM's do have advantages. Whether it is worth it is up to the individual, who should do their research, not just believe the hype involved in marketing these days, or what they read on some internet forum.