This might not be important for web designer, but if affinity wants to get. Feel free to post a request for this (with a clearer title). It is possible to rescale a bitmap fill by either restricting or allowing for the bitmap fill to grow or shrink when transforming, depending on the desired effect.
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It has largely been replaced by formats better suited to.
You can also apply bitmap fills to objects, allowing you to add a bitmap image from an external source (like a pattern or texture) which can then be transformed on the object.
Bmp is indeed an uncompressed, bulky format, lacking support for advanced transparency or modern metadata. You're right, there's no bitmap mode in affinity designer/photo. Here's a simple example of this. I'm disappointed that i have to resort to my ancient version of adobe photoshop to generate a monochrome bmp file after buying affinity 2 and affinity designer.
I may have stated the question incorrectly.