What problem does this solve or what need does it fill?

Text layouts are generated with the y-axis increasing downwards, but with bevy_sprite the y-axis increases upwards.
In bevy_sprite_render extract_text2d_sprite negates the y-coordinate for each glyph and text decoration individually. The system could be simplified by transforming the coordinate space instead.

What solution would you like?

Transform the coordinate space instead of negating the individual y values.