Re: benefits/ disadvantages of tensioner-less chain?
It's been advised, discouraged & discussed a bunch TBH... If you've horizontal dropouts chain adjustment is not as much of a problem & you can ofc use a 1/2 link as well, but aside from those bikes there's also the unfortunate fact some frames need a tensioner to act as a redirect (so the chain will clear the lower chainstay).
While the simplicity of running w/o a tensioner seems attractive & looks great sitting in the garage, it just isn't practical for bikes ridden frequently. The sprockets and chain will always continue to wear, requiring periodic adjustment of chain tension & w/o a tensioner this becomes a chore to say the least, often entailing more problems than simply making a better tensioner than the stock kit one;