I was reading some material online - seems to be a mixed bag of people who analyse yields vs maturity and yields vs duration.
To me, looking at yield vs maturity is slightly misleading - as, for a single maturity there are sometimes different issues with different coupons. These all trade at a different yield which (in the absence of financing advantages/structural factors/liquidity premia), I'd attribute to coupon differences, therefore, there is no real RV.
Instead, isn't looking at bonds of similar duration a 'cleaner' approach to identify RV (as obviously you are only comparing apples to apples here)? If so, what is the reason for people still looking at YTM vs maturity in the context of RV?