With SF builds, its just so variant what their secondaries (like OD) might be and that radically changes value. But I think if they had a way of looking at the value of skills like OD, PA etc. for the age/potential/height (and ignore position) it could give a better number which reflected the value of players with a lot of skills, just maybe not really high primaries/DMI, espeically in that SF spot...it also applies for bigs though whose PA/HA/OD/JS/JR/DR are all huge factors in value but not factored. 17 RB with 1s in secondaries is worth nothing whereas 15 RB with 5+ in all the secondaries is wroth a million, 8+ in a coule and you can get 2million etc. on a low salary big but the TPE maight just say 500k LOL regardless of secondaries if primaries are similar.
Yes, yes, a million times yes, did I mention yes?
Although it's still not ideal, Hattrick's TPE matches up based on the main skill, but also includes ranges for secondary skills (and then the most recent changes fuzzied it even more, to have more varied age ranges as well). I don't put a lot of stock in the TPE here because it's just silly.
The only problem in implementing it (well, besides finding someone to do it) is that there are a much greater number of useful secondary skills here. In HT, if you're buying a MF, you might look at passing or defense, or maybe at winger for special cases, and that's really it. Defenders might need some passing, or MF or wing. But to address the three skill donkey big men vs. the really valuable 8+ secondary guys, you'd have to be looking at pretty much 10 skills, and finding parameters that would constitute a valid comparison without needlessly limiting the result set is difficult.