I just watched a video on 1by vs 3by and it was the conclusion that the 1by was merely a marketing ploy for old MTB to buy new bikes or accessories for 1 by: Here are the cons vs the 1by:
1. Loss of range for the lowest gear and highest gear. You run our of gear at 1 by;
2. The chain line; chain drops because of cross chain It is better to have 2by or 3by for better chain alignment. The fd also prevents chain drops.
3. More wear and tear for 1 by especially for the chain rin; it is better if you drop the chain in difficult portion rather than shifting your cogs;
4. The 7 speed of 3 by lasts longer than thinner cogs and chain of 1 by and therefore is less sturdy
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