Welcome from Texas. Personally, I see no benefit from omitting the elec starter, I like it! But besides weight savings, the wiring could be simplified if you are building a new harness.
My current project is a 550F and I find the front brake adequate when used with the rear brake.
True, compared to modern systems, it is not the best.
Will you be tracking the bike?
Why not get it on the road, evaluate your needs and then upgrade later if you feel the need?