Comments - ST_Transform missing?
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So far the SRID property is just a dummy in MySQL, it is stored as part of a geometries meta data but all actual calculations ignore it and calculations are done assuming Euclidean (planar) geometry.
So ST_Transform would not really do anything at this point anyway.
I think the same is still true for MariaDB, at least the knowldege base page for the SRID() function still says so:
https://mariadb.com/kb/en/mariadb/documentation/gis-functionality/geometry-properties/srid/