I think the line thing is mental.......If the fish are biting it doesn't really matter. Plus that great line will feel totally different with a big fly, bushy fly, heavy fly, sintip, whatever. If you want distance for salt et cetera use a running line and if you want to mend don't. It is as simple as that isn't it? I think the only good way to judge a line is durability. Furthermore I hook most steelhead 30' or less in front of me. If I need more distance I am using a spey which doesn't even need to shoot that well as I can roll cast 60'. I don't think I have ever hooked a river salmon/steelhead more than 65' away. If you want an indicator nymph line use a permanent marker on your fly line to mark it or loop on a couple feet of floaty line of the right diameter with marks ( this can be a pain to cass but won't mess up your perfect line and I think it still feels better to the soul and wrist than a strike indicator )
If you want that butter casting every time than only fish small dry flies on WF lines. Unfortunately that limits your quarry.