Why open the door when standing on your feet when you can also open de door while standing on your head ?

So the answer to your question is simple. If using knots is sufficient, then why invest extra effort to make a splice in a 2-stage dyneema line (mantle and core) ?

2-stage dyneema is cheaper then D12 and other non-core spliceable line and the outer mantle protects the dyneema fibres in the core better; this is good for long term use.

Basically, using knots is easier, cheaper, faster and more durable in the long run.

Why use a splice where a knot is sufficient ?

Wouter