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Why don't bricklayers use this magical substance? If there's nothing to even out the courses, then unless your bricks have absolutely perfect dimensions, it's going to go all wonky quite quickly.

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Building glue is not magical and it's widely used, at least in western Europe. Glue is rapidly replacing mortar (just not for foundation and facade stone). Also, it dries a lot quicker than 45 minutes. A builder doesn't have to wait at all to add additional layers. And at the end of the workday, you just drop you glue gun, no need for lengthy cleanup of everything used to make mortar.

my house was built like this. The bricks had perfect enough dimensions for the small bit of glue to compensate

Only for indoor bricks, wienerberger Porotherm https://www.wienerberger.co.uk/tips-and-advice/blockwork/how...

Very cost effective.

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