I only use ninja squid E-litre in SZ or TW. Post patch, I feel a lot more vulnerable in close range combat, due to the partial charge nerf. Rather than jumping back to base every time and lose map, after some experimentation, I found that ninja squid really helps slip away to a better location or hide in the tinciest dot of ink, and then snipe them as they turn their back (or ebomb them in their confusion
). It's an ability that works best when someone is chasing you. I've seen quite a few solo randoms with ninja squid E-litre recently, whether it's new meta or an ability crisis, I don't know.
On swim speed, I don't think vanilla E-litres need it, as you spend most of the game in one spot at a time - you rarely swim. In the same way splatlings don't need swim speed because they're always on foot. Since you use E-litre way more than me, if you decide to trial ninja squid I'd love to hear your verdict, Azure.