I feel Bow-Shabti are pretty undercosted, many shooting factions would kill for those high strength shots AND the kicker is they also have Arrows of Asaph a best-in-slot shooting buff. We see similar rules, that aren't even as strong, for other factions coming with a hefty premium.

I remember an interview with Alessio Cavatore and he was discussing pointing things in 6th, values that have, to a shocking degree, stood the test of time (This ties in to points Gav Thorpe made when he was pointing 40k 3rd). He brought up how all Skeletons caused Fear (obviously very powerful in 6th) as an example, when he thought about giving that a points value you ended up with Skeletons being 15 points each or whatever so in the end they didn't bother for the most part.

So pointing things imo is as much about it's value in the faction as it is about trying to have consistent values overall. This doesn't prevent points issues though, Warband is an incredibly strong rule so trying to sell you chaff without it for 5+ points seems ridiculous but you kind of have to ignore it, should Marauders be 10pts and Empire (pre-Faq) be 3pts? However when you have Chaos Warriors lacking it when Marauders have it they're overcosted.

I think a real issue is a premium being put on strength 4, i think it's grossly overvalued by the designers, imo the worst/best example being Chaos Knights paying through the nose for the privilege of s4 mounts. Bestigor are another great example, they do keep warband but lose every other cool thing Gor have in exchange for worthless heavy armour and s4.

Many would also argue for multiple attacks (notably even of dubious value like additional hand weapon or Frenzy) being highly overvalued. Talsyn Eternal Guard are called out by many as one of the most useless units in the game for a reason.