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Pine needles aren’t actually that acidic, especially as they break down. It’s the turpenes that work as a herbicide.

The ground under a pine tree is its own little biome. It tends to be dry most of the year, which in addition to the other allelopathic chemicals, keeps things from germinating.

You might want acidity. A lot of berry bushes like blueberries love soil down to pH of 4.0

Tomatoes like a more acidic soil as well.

Many flowers etc. in my beds prefer acidity. If it gets too acidic some lime can adjust things back.

> ... If it gets too acidic some lime can adjust things back.

You probably mean lye [1], which is alkaline to neutralize the acid.

[1]: https://en.m.wikipedia.org/wiki/Lye

Lime is alkaline, too, and cheaper:

https://en.m.wikipedia.org/wiki/Agricultural_lime

I thought limes are acidic.

Limes (the fruit) are acidic.

Lime (the fertiliser) is basically ground-up limestone and used to reduce soil acidity.