Awesome first pic! 😀
Hm.. I admit you’ve got the point these exist, especially near stations, I agree. But these are for junction reasons not crossing. When 1 2-track splits into 2 2-tracks for example. But still agree with me they are inefficient because the train on the crossing track makes incoming train wait for it to cross, and vice versa. In the second drawing there’s a conflict between the Up Southburry and Dn Cambridge lines. In absolutely all new constructions I’ve seen in Belgium, Germany or Switzerland they always use the bridge over the track, the motorway-style.
But yes, near stations where speed is slower these are quite helpful.