If we think about quality of music videos, the most 2nd gen groups had 480p or 720p quality.
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Like you see 2010 still not full hd
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During 3rd gen(2011) Groups start mainly debut with 1080p quality!
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Gidle and IZ*ONE still debuted with 1080p quality so imo they are not 4th gen. Everglow and Itzy debuted with 4k quality that's why they are the first 4th gen groups.
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5th gen will obviously start once the group debut with 8k quality MV 
