Even though the number in Google Analytics shouldn't be trusted 100%, but they certainly giving a big picture of what's happening with your website, and for website's traffic, they have great detail on how much traffic is coming to your website, where it comes from and the quality of the traffic. Lately, bots traffic becomes an increasing problem, because it’s leading to obvious skews in data.
Why bots traffic giving you problem? Because bots traffic mainly a wave of automated traffic to your website, because it's not real person, so the traffic that your website get doesn't have real value, at worst, it's malicious. When you though your website has high stats on traffic, but actually it can affect negatively on many other stats.
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