Here's the thing though: that's not really a good counterexample because there are multiple saints and generally Catholic priests and the like that are still able to practise their religion even in prison. If you are in a situation where you can't reach a priest and have no access to the sacraments, then by prayer and meditation you can still confer grace since God isn't limited by the sacraments. However, it makes it that much harder though because 1) the whole point of the sacraments is to give us a physical sign that God is with us and near us. That's the whole point of some entire sacraments like Confession, Baptism, Eucharist and implied heavily by the others and 2)if you are actively avoiding the sacraments, then you are essentially kicking yourself out of the Church for one reason or another. And Catholicism isn't unique in the aspect that it is like all other religions fundamentally a social bonding experience as well as something that helps bond us to God. Why do you think Jesus got Apostles instead of doing his mission by himself? He literally said he didn't come to overturn the Law but to fulfill it, and there are multiple social obligations and stuff of that nature in Ancient Jewish law. And again this isn't even unique to Catholicism. Muslims have an obligtion to pray in a mosque on Fridays as Jews meet in the synagogue on Saturdays. Sikhs and Hindus and Buddhists celebrate their holy days in festivals that encompass hundreds, sometimes thousands of people, which is behavior you find in primitive hunter-gatherer societies with shamans and the like and in Antiquity with the Romans, Greeks, Persians, Ancient Chinese, etc. This Protestant understanding of religion only being a personal thing is so ahistorical that no society except those derived from Northern Europe in the 1500s (or those that have adapted their beliefs into their culture) practices such things: because it's fundamentally unfounded on actual fact. It's a myth people perpetrate to keep up appearances of the Enlightenment being a success when it clearly is anything but.