Rek'Sai E vs. Bard E

Why does Rek'Sai's E have a much more finicky placement compared to Bard's E? The difference is so significant that there are two different learning curves to each (Rek'Sai being more difficult given the more picky placement). The limits on Rek'Sai make it far more annoying to guess how far her E can go over walls let alone the far fewer placement locations one can utilize. Rek'Sai was made before Bard so the only idea I have in my head is that you improved the programing of the mechanic on Bard.

If on the other hand this is a deliberate design choice I have to ask why? Bard's E can be used by everyone and has a time limitation (albeit a very time uptime) along with a speed buff to allies (plus a combo to his Q or R). Rek'Sai's E can only be used by her alone and while she can have up to 8 of them active they can be destroyed by any enemy champion. Add in the fact that Rek's E can only be used in more specific locations and only a shorter distance than Bard's E I find Rek's E to be a balance issue.

Bard's E is not destructible but it has far more uses even in places Riot likely didn't think of, such as the bottom lane wall trick which if used properly can shave off about have the walk distance back at 100% aim.

Rek's E is destructible (but permanent otherwise) and can be used in far less places and much lower distances. It also provides no buff to Rek'Sai (Bard's E gives speed to allies).

I'm not seeing why Rek'Sai's E cannot be as open to location and distance as Bard's E. Therefore I would ask Riot to consider apply Bard's coding to Reksai's E (in the sense that it can be placed in far more locations and at longer distances). As it is right now Rek'Sai is certainly playable but after enjoying the hell out of Bard I feel cheated out of a similar experience with Rek'Sai. Their abilities are that far apart in terms of usability.