Thanks for this interesting comment. There are various points which I should answer in there.
After that convo I remembered some previous discussion of ours, probably took place some years ago, where you were saying that, if I recall, the Standard Model is the most verified theory in existence, supported by trillions of observations, something like that (I may be misremembering and misexpressing, but I think the point is the same!)
I would not say trillions but a few :-) The point is however the same, as you said.
For the rest, the picture of the iceberg answers it pretty well, in my opinion. Whatever is the true theory of nature, at the energy scale of the Standard Model, it is equal to the Standard Model. This is why we are talking about extensions of the Standard Model.
Therefore, depending on what you want to do, making use of the Standard Model may be good enough. To rephrase this, let's assume you want to calculate the speed of a car. There is no need to use special relativity here. This will just make calculations way harder for a numerical result barely different.
Does it clarify?
Cheers!