tl;dr: I don’t think this change is necessary, it is fine for me.
I don’t know if this change is really necessary, most epics are very hard to do but there are some epic creatures that is easier to make direct hits (like koolasuchus) for me at least, I didn’t find the 6 and 10 direct hits achievement so i believe is not for my current level yet (I am at level 9), 6 hits I probably did at least once that I remember, 10 I am not sure but probably not.
And even if those achievements are very hard to do for most people, I don’t think they are impossible and I believe some achievements needs to be harder to do, achievements can be different than daily missions or other rewards in general, if every achievement is easy to do like normal hits, it would be very boring, I don’t think every achievement should be for everyone.
From my point of view, it is not just about help us players to get more resources in the game, but also about reward those with specific skills, and the reward is not just the resource you are given when completing the achievement, but also the feeling of “I did it, finally”, which is more fun than just being able to complete everything so easy for a random resource.
The same way I don’t think these achievements are impossible for me (hard but not impossible), there could be some achievements that feels like impossible to me, but it is not that hard for you.