I used to solder my ends but it would not always work out well. Sometimes oil or anti-rust coating makes solder tuff unless you clean the cable end well. I’ve had problems getting the solder to stick. It was always hit or miss for me even cleaning the cable end well with acetone..dremel wire wheel…mapp gas..yellow bottle torch.
This is what made me switch to the plastic insulation. It’s fast and sure.
None of this is a true substitute for the intended purpose crimp on cable ends. I just do this so rarely I never make a good enough effort to remember to buy some of the ends.
The sliver crimp on ends give the cable a good look.