system
Given the following post, respond as if you're commenting on Reddit:
human
[Dragon Ball Super] Why is the present Android 17 so much stronger than the Android 17 in Future Trunk's timeline?

Recently, it was shown that Android 17 is about the level of Super Saiyan Blue. He was able to approach this power level despite only having worked as a poacher for several years.

Meanwhile, Android 17 in Future Trunks's timeline seems to be less powerful than Cell. 

What explains the difference between these two characters when they have the exact same enhancements?
gpt
The 17 of the original timeline was an untrained savant. He never had a reason to improve himself because he never met somebody he couldn't beat (until about 5 seconds before he got vaporized). The derivative 17 was eclipsed between cell and the hyperbolic time chamber trained saiyans, but lived through the process. This gave him ample motivation to apply himself in his training.

There's a lot of similarity here with Frieza, who had similarly never applied himself until after his (repeated) defeats at the hand of super saiyans, and spent all of 4 months surpassing super saiyans because of his innate talent. 17's baseline is a lot more powerful than Frieza's baseline to boot.