re: Can I just say, Apple users frustrate the heck out of me?

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I converted them to the format that every other manufacture in the world uses, and they preview just fine.

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HEIF is not an Apple-created format (unlike Google's WebP image format they push to speed up websites in exchange for improved SEO scores). Some Android devices use it as default, and it was developed by the MPEG group, is an ISO standard and many devices from many manufacturers support it. Not only does it provide greater compression than JPEG but it can do higher color depth, HDR, etc.

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The exact same image, at the same resolution, just in another format. So it's a logical conclusion to blame it on they file type.

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HEIF decoding is more intensive than JPEG decoding, but is far more parallelizable than JPEG decoding, so as file sizes get larger and core counts increase in modern devices, it will pay off more and more. Maybe your software is using a shitty single-threaded implementation? Or you have some ancient single core laptop? The rest of the world doesn't need to waste bandwidth, storage, and available processing capacity so you can video edit on your "poor laptop."

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There's a reason that there are dozens of "HEIC to JPG" apps on the web and in the play store.

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Yeah, because JPEG is one of the most common file formats in history and there are decades of devices and software that work with it. By your same reasoning, the dozens of VGA-to-HDMI adapters Amazon sells is evidence VGA is the superior display technology.