Another downside of a large tank is that you draw the water level down farther in the well with each pump cycle. In some wells that can cause poor water quality and it's not a good idea with a low recovery well.
Tanks usually last 15-20 years. Pumps 10 years or more but some fail in less than 10 years. That's pumps form old time manufacturers, not big box store brands.
IMO you are better off with a small tank and a CSV than a large tank. You'll spend much less money, take up much less space with much less weight if that is a concern and the system is much easier to work on if needed.