Maybe the lack of Tiesto made him produce a solo and he wanted to try, but in Ligaya, for example, there was no idea for the track? The new Gouryella is System F, I definitely agree with that because it is enough to listen carefully and see what other alias is taking the style. In 2015, the whole world said that Anahera is an 80% copy of System F - The Sonnet.
The conclusion? He did not want to move System F, he took it for reviving Gouryella and so we have Gouryella which sounds like a modern System F.
If someone is the fun of a given artist, he also has the right (literally and figuratively) to demand new sounds and transitions. That this alias was somehow livened up with new melodies and not artificially hackneyed samples that everyone knows and can listen to. But that is my subjective opinion
Tiesto never really had anything to do with the original Gouryellas,it was all Ferrys production...we know now how many ghost producers were working for Tiesto in his tracks. Not sure what youre point about Ligaya is,that was in true Gouryella style as much as the first ones,he wrote it alongside John Ewbank in a classical melody.
But...I agree the modern Gouryella tracks have lost that classical melody style and are more suited to be System F tracks.