A ratio in the 1.30–1.38 range puts you in very aggressive, low-and-stretched territory. These bikes are built for maximum aerodynamic advantage — your torso will be flatter, your hands lower, and your weight shifted forward over the front wheel. This is the geometry you'll find on pro-level aero race bikes and criterium machines.
The trade-off is comfort and accessibility. Riding in this position requires significant core strength, hip flexibility, and comfort with weight on your hands. For most recreational riders, this ratio will cause neck, shoulder, and lower back fatigue on rides longer than an hour or two. It's not impossible to make it work — a good bike fitter can raise the bar with spacers or a different stem — but you'd be fighting the bike's intended design.
This ratio makes the most sense if you're racing, doing fast criteriums, or chasing time trial PRs where aerodynamics genuinely matter. If you're doing long group rides, gran fondos, or just want to enjoy miles without discomfort, you'll likely be happier closer to 1.42–1.50.