1. If a copy is better than the original, then everyone will diss the original
2. If the original is better than the copy, then everyone will say nothing is better than the original
3. Im not saying who is copy of who, but that's the nature of how it is being viewed and will be interpreted given the trend of things
4. Each group, whoever it may be, only wants to be the 'first' to do it- whatever that may be- and take credit, well, in this case its more of the stans who wants the credit. As we all know, no matter how much stan fight, idols are lovely to each other on a personal level.
Im not a fan of either group so I think Im pretty unbiased about it.
These came up alot back then; Twice and SNSD, 2ne1 and BP. It's definitely normal to be compared to previous groups. Because there is no originality in KPOP. Each group needs to be consists of something of their predecessors and you will find similarities if you look hard enough, or the similarities will find you if that's all you are looking for.
Apple iphone branding sells really well, why the hell would they opt in for another maker and innovation? Same with KPOP.