should there be different standards for grading coins from within the same series...

First let me say that I think the Third Party Grading system is great{meaning the top 3or4 companies of course}.They add security to your purchase, help set an industry standard, preserve these works of art, and they get the grading right most of the time{except for my coins which are all under-graded..}.I was thinking about how certain coins within a series..ex: the 1917-S obv and rev Walkers...have consistently weak strikes. Should the BEST examples of these coins be graded the same as a 1942 Walker with a strong strike...even though the skirt lines,left hand, eagles' breast feathers etc.. are missing? I have no problem with either way they decide to do it, as long as they are CONSISTENT!!..Another example for those who collect Buffalo nickels...usually the braid in the Indians' hair must be well-defined to get a gem or better grade, but I often see some of the years where there are none struck that well{look at most of the D mint coins from the teens}getting 65-67 grades.Anyhow, I've rambled enough...I'm sure I've confused a few who might read this, and for those who understand and even concur-I'm just preaching to the choir...here is a MS61 Walker 1917 Rev S...without rub, jsut a weakly struck year...by ANA grading standards...a true 61...by comparison to others from this year under-graded{like all of my coins..wink wink}

MVC-920S.J