The Brooks Ghost 13 is not very hard at all. It is you, just like when a Computer commits a 'mistake,' it's because of the person on the keyboard. The density, is pretty soft, such as my guess, a 40 on a durometer scale. Shoes really don't 'age' sitting on shelf much either.
I am a former Shoe Rep/Tech guy and most these days are softer, it not too soft. For example, the Nike Pegasus is like a bedroom slipper. I was around in mid 70's when that shoe first came out. Shoes, prior, like the Adidas SL-72 were as hard a rock. Even the Tiger, pre Asics, Monterrey was softer! Foam synthetic EVA has generally always worked for most runners.
I tell runner's, that it's the purpose of a shoe to compress/absorb the impact and save our bodies. Better for the shoe to break down than us. Thus 500, for most if max life. Even with gels, grid, air, you name it, the surround foams break down. But, that's a good thing. I've been running/racing 50 years, luckily, due to genetics, but a former college coach that was a shoe expert. Later, when on the write the Runner's World Shoe Review's for 25 years! Hint: Tom Brunick who worked along with Amby Burfoot with Runner's World. Bob Wischnia and many others.
Presently, some shoe manufacturers might not like this, but many seem to be skimping on materials? Perhaps intentionally as most runner's aren't like we used to be in the 70's when 'high mileage' was the norm. 100-miles a week, or you were considered a 'light-weight!'
Again, back to the current footwear these days, most of lighter/softer. Look a Hoka, Nike Pegasus, Brooks Ghost, especially the ever popular Adrenaline GT. When that shoe first came out, it was very stiff! Density of maybe 35..firmer/denser, the lower on the Durometer scale.
Not to favor anyone, but Saucony is pretty consistent as is New Balance. With NB, the 'fresh foam' is excellent. I like and train in the NB 860v. I used to like the Brooks Adrenaline, but these days it's way too soft for me. The guide rail system simply doesn't provide enough stability for my fallen arches. Another pretty good shoe is the Saucony Guide. Ever so consistent and I personally love the foams Saucony utilizes. Ironically, I can't even think of a Nike stability shoes that gives enough support, for an over-pronator. Again, I'm 65 years-old now, have a life and don't run 100 miles a week. I've got my retirement to enjoy. Running is not a priority, but having good shoe are!
Finally, getting back to the Brooks Ghost being hard, I really don't think so! Companies are giving up less bang for our buck. It's now about 'profits' over quality, Not all, as Saucony and NB continue to deliver! Most all, these days have manufacturing in Vietnam. Cheaper labor, less product, it all adds to inferior product in my opinion. (don't shoot the messenger, but, look next time at the tab on your shoes..see: Made in Vietnam) Sure, the shoe factory are modern and all, but again, it comes back to cheaper components in my humble opinion. I've not vested interest in any shoe company. Nobody is paying anything, but I just had to chime in when I saw this topic. Bottom line, runner's, 'Better to have a softer shoe." Let it break down, better the shoe than you. Help prolong life of the shoe and stay off the sidewalks. Concrete kills shoes, joints, knees and lower backs. Run on the asphalt but safely. Best if you run on trails.
Stay fit friends! Good luck to our Olympians as they head to Tokyo!