Blank Space:
The reason for that blank space was to provide a heatproof surface for pots and pans taken off the stove - since electric burners don't cool rapidly, you have to have somewhere to move a hot pot or pan to. That was what it was meant for, but...
...in actual practise, the space usually got devoted to overflow items from the countertop. In the house I grew up in, we had a Frigidaire 40-incher, and I never saw that space clear unless some major cleaning was going on. Even then, once the cleaning was accomplished, the items went back in "their place" until the next time. If you want to know what my mom did with hot pots and pans, it's simple - she always put them in the sink and ran water into them to cool them down. We had the most warped pots and pans you ever saw - and I'm talking Club Aluminum here, the only pieces of that brand I've ever seen warped.
G.E.'s arrangement of burners, with all four of them clustered at one end of the top, was the best. Some other makes put two burners at one end of the top and the other two at the other end, which wasn't as efficient, since any pots and pans removed from the burners had to go between the burners holding stuff that was still cooking.
I had another 40-incher (a Westinghouse) some years ago, and that worktop I kept clear for its intended purpose. Worked very well. The only thing I ever put there beside hot pans was the percolator, which I set up at night and left there, plugged into the convenience outlet. Next morning, coffee was ready, and after the pot was finished, I would remove it from the rangetop, cleaning it and putting it away until after dinner dishes had been done and it was time to set up the next day's coffee. It was a great arrangement.
Nowadays, with only a 30-inch range, I have to have a heatproof mat next to the work surface.