I sometimes switch media if I’m getting to constrained, specially during ideation. I’ll go back and forth between pencil, pen and gray marker w/pen & sketchbook pro. I try not to use templates at the beginning so that I don’t get too constrained.
Like others have mentioned, once I need to create presentation drawings or proportions need to be correct then I’ll use a 3D CAD template. You can reduce the opacity to 10-30% and print multiple pages and then just sketch over them. I’ll use my loose ideation sketches and modify them to fit the proportions. If it’s a simple model or basic geometry I’ll even create renderings and digitally sketch over them.
Whatever works.