Modern pocketknives are no better than, and are actually lower quality than 1950s knives. The steel used in the vast majority is cheap 440A which is a crap steel for cutlery. Plus, the overwhelming majority are made in China for pennies.
Modern cars are no better than 1950s cars. They just have more gadgets to distract you from the fact that you're driving an overpriced piece of crap.
The 1912 Gem single edge razor is the next best thing to a good straight razor shave, and a good straight shave is something no cartridge blade can even approach.
I used Cartridge razors from 1990 until 2010. I started with the Sensor and worked my way through the M3, Quattro, and FUsion. The first gen Sensor carts shaved the best of all of them.
I have a 1984 Atra handle and use ASR/Personna made cartridges for it( I got the handle for free and got the carts for $4.34/10) and it shaves much better than my M3/FUsion ever did. The center pivot blade design is much better than the limp wrist pivot used today because it didn't require so much pressure to do the job.
If you want the ultimate in cartridge razor shaves, you should try the Gillette Trac II. It was non-pivoting and required even less pressure to keep the blades in contact with the skin.
That said, the best shaves I've ever had have all been with DE, SE, and Injector type safety razors. I can get consistently closer and smoother shaves than I ever did with carts.
The worst shaving cuts I ever had were with cartridge razors. The last straw was when my POS M3 took out a hunk of my top lip, and a hunk next to my mouth.
The cuts/nicks/weepers you sometimes get with a vintage style safety razor are a lot less painful than those with a cart. I got myself with a Feather blade one time and didn't even feel it. There isn't a cartridge blade out ther that's anywhere near as sharp as a Feather blade.
Cartridge blades gave me ingrown hairs/zits and I could only shave every 3 days or so. i shave every day with my old safety razors and have yet to get a single ingrown/zit. My face is as smooth as a baby's butt every morning and it stays smooth all day. With carts, I felt like I needed to shave again by lunch.
You can spend a LOT less on shave soaps/creams and still get a fantastic shave. Arko shave sticks are $1.50 each. Van der Hagen shave soap is about $1.50 per puck and I get at least a month of everyday shaves with each.
Godrej Shave rounds are $0.99 each and work just as well as the Arko/Van der Hagen(wonderful).
Godrej and Arko shaving creams run about $3.00 a tube and they're light years ahead of canned goo, as are shave soaps.
You can add a nickel sized portion of Noxzema facial cleansing cream to the top of your soap puck before lathering and it makes a fantastic, creamy lather that lubes and cushions very well.
In short, you can shave cheaper and better with a vintage/vintage style safety razor and soap/cream than with modern cartridge razors and canned goo.
The Fusion is hard to use on the top lip because the cart is almost as wide as the top lip.
The Quattro gave me the worst razor burn I've ever had. It was like dry shaving.
In fact, shaving with a multi-blade cartridge is only wetshaving with one blade. The other blades are dry shaving you.
But, if you'd rather use carts, be my guest. That's one less competitor at the antique shops/flea markets/fleabay.
If you want an easy, BBS, comfortable shave, you can't beat a Feather blade loaded into an Edwin Jagger DE87 or a Merkur 37/39 slant. There's no comparison. Except maybe a Treet SE blade in a Gem Micromatic, or a Schick Injector blade in an E or G type injector. Don't even get me started on the Gillette Red Tip and the Neillite 400 and the Gem 1912.
RE: headshaving with a DE. I shave my head with a DE as well as an SE and an Injector. I get a lot less pulling/tugging than I do with any of my cartridge razors. I don't get cut any more with it, either. If you're cutting your noggin when you shave with a DE, you're either going to fast, not paying attention to what you're doing, or your technique is not right for noggin-shaving. my Gem Micromatic SE is a very aggressive razor and it does a great job on my head. My old Schick injectors are even better. The injectors don't get clogged up the way carts do. In fact, just last night, I shaved my tater with a Merkur 37G slant and a 1980s vintage Topco DE blade. It was like the hair was falling out. First a wash, then a lather with Arko shave stick, and then a shiny, tan dome.
Regardless of what razor you use, your pre-shave prep is the most important step. Poor prep results in poor shave every time.
There's nothing like a badger brush full of Godrej Menthol Mist/Rich Foam/Fresh Lime/Palmolive Refreshing Lemon/Old Spice Original (all Indian made creams) and a good safety razor loaded with a sharp, smooth blade.