would it work to lay rail without ghost?
like you hit the end of a track and it just places the next straight piece.
if you turn right the next piece will curve right. left same thing

No, it's a different approach from FARL, it only build where there is ghosts

FARL has originally been made when we couldn't do rail planning, maybe FARL will revive one day
I don't want to replace FARL, I want that Rail Layer to be a approach that correspond to modern factorio

So you need to use blueprints or ghost rail planning.
There is the Dual Rail Planner mod if you want