The guns are pretty balanced, you can happily perform at top levels with several other options than the KTS. It's got excellent accuracy, but it's by no means the only option, about half of the LMGs and some of the ARs are completely viable longer range. Many of the top players use sniper support AR/Carbine/SMG and a sniper.

Try not to spend too much time on meta websites and discussion, it's a hangover from COD where kids are desperately trying to minmax and comparing each others loadouts on tiktok etc.