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But isn't the immune system classed as anti-fragile? By this, I mean that if you don't use it then it gets weaker.

With all this constant disinfecting, are we not doing ourselves out of our ability to fight things off in future?

There's not really any proof that hygiene hypothesis leads to better outcomes. Yes, the immune system generally only strengthens when it's exposed to pathogens, but being exposed to lots of pathogens also damages your body. And controlled exposure to pathogens (ie, vaccines) can trigger an immune response without injury. So, we're likely trading weaker immune systems for millions fewer deaths. Look at the mortality rates due to infectious disease in countries with poor sanitation.

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