The Dragon Engine peaked in Lost Judgment, makes you wonder why they decided to switch to Unreal 4.
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I remember reading article about Ishin, the producer stated that Dragon Engine was designed to simulate night city (eg Kamurocho, Sotenbori, Ijincho), hence when they had to do Ishin they shifted to Unreal because it's easier to simulate the daytime in Kyoto environment
I might be wrong but that's a gist of it, lemme search for citation a bit
Edit: Found it, it's from interview with Masayoshi Yokoyama. It's written in Indonesian however, you might need some Google Translate for this one.
Remake yang Gokil, Wawancara Like a Dragon: Ishin dengan Masayoshi Yokoyama - gamerwk.comhttps://gamerwk.com/remake-yang-gokil-wawancara-like-a-dragon-ishin-dengan-masayoshi-yokoyama/