This version of the coat of arms retains the red Dragon of Wales as in the Original United Kingdom when Wales and England were united before the addition of Scotland from 1284 until 1603.
The dexter lion supporter is deleted but the English lion is conserved on the crest. This gives the English lion on the crest more honor and value, and is less redundant. Also, the lower sinister shield has a Welsh heraldic quarter. This gives the UK a full palette of rainbow power. Not only does the Welsh Dragon and Scottish Supporter make sense, they providentially reflect the English colours—red and white.
Maybe a future reigning monarch, a potential King Charles the III or William the IV or King George VII, will adjust their royal banner to include the dragon? The Dragon and Unicorn echo like Yin and Yang. Imagine the Serene and Peaceful Unicorn united with the Intimidating and Powerful Dragon.