Well,
I haven't been trained yet, but there are reasons, why things are done this way.
First, yes, you can attach more weight to a H145 - but... cycles go up exponentially with weight.
So you rather do a couple of 750 Liters drops instead of a few 1.5to drops.
Second, Airbus brought up rules about connecting Bambi buckets to the H145.
Even directly attached, the bucket could get into the fenestron - that's why a long line is needed.
The pilots have the bucket in view - with mirror and additional with a camera build in the tailcone.
The Operator on the skid drops the water.
I know, there is a lot of experience in Portugal, Spain, US and Australia - but also some in Germany.
It went a lot of effort in the procedures, working together with squadrons doing Bambi for years, as well as the fire brigades, the forrest department and so on.
We will se, how this develops