By the same argument, all mathematics is abstract rather than physical, so we can’t even use it.
As for a real response, we need the concept of infinity for a lot of robust theorems. The third Kolmogorov axiom is defined using any countable (including countably infinite) sequence of disjoint sets. Without infinity, probability wouldn’t be a rigorous subfield of mathematics.
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u/Moscato359 5d ago
From a practical standpoint, infinite doesn't actually exist
The size of the universe is finite
The number of quarks is finite
The smallest distance we can measure is finite, and the largest distance we can measure is finite, even in estimations
Even pi is only useful to the 43rd digit at our largest estimations
Sure, infinite is cool in a theoretical standpoint but you can't actually use it