In the scope of a greater "10000 BC" mod those might be interesting.
In the standard game... The time frame these units are interesting is very-very short, there are not many cities around to build stuff, so ultra-ancient units (Right now it's just warriours) are not used a lot.
Also i do not really see the space in the tech tree to put those in.
And the "reduced strength" variants are just too bad (again compared with standard game unit progression). Many players already dislike and avoid Archers because those suck badly... Who would want to build a even weaker version of it ?!
But the things are entirely different, if you plan on a Mod/Scenario focusing on the very erly ages of history.