Actual HDR needs at least 10 bits per channel and a modern display with peak brightness far in excess of traditional monitors. Ideally over 1,000 nits compared to typical LCD brightness of about 200.

You also don't need "three pictures". That was a hack used for the oldest digital cameras that had about 8 bits of precision in their analog to digital converters (ADC). Even my previous camera had a 14-bit ADC and in practice could capture about 12.5 bits of dynamic range, which is plenty for HDR imaging.

Lightroom can now edit and export images in "true" HDR, basically the same as a modern HDR10 or Dolby Vision movie.

The problem is that the only way to share the exported HDR images is to convert them to a movie file format, and share them as a slide show.

There is no widely compatible still image format that can preserve 10-bit-per-channel colours, wide-gamut, and HDR metadata.