Here's what Briggs said. Nothing on why this engine was designed the way it was.
They got back to me pretty fast!

Note that my Haynes manual says 65 ft/lbs for the flywheel torque, but here it says 60. *shrug*
"Hello Jonathan,
Thank you for your inquiry.
The following Tech Specs and alternator specs is the info that I have available on engine model and type # 132432-0227-01
I am also attaching the Illustrated Parts List for this engine.
SKU 132432-0227-01
Technical Specifications
Model Series 1324
Displacement 206
Oil Capacity 20 oz (0.6 l)
Valve Configuration L-head
Flywheel Torque 60 lb/ft (81.5 Nm)
Governor Arm Torque 40 lb/in (4.5 Nm)
Carb Mount 75 lb/in (8.5 Nm)
Plug Gap 0.03 in (0.75 mm)
Intake Valve .005-.007 in (.13-.18 mm)
Exhaust Valve .009-.011 in (.23-.28 mm)
Idle Speed 1750
Air Gap .010-.014 in (.25-.36 mm)
Flywheel Puller Part 19069
Flywheel Holder Part 19433
Connecting Rod Torque 100 lb/in (11.5 Nm)
Sump Torque 100 lb/in (11.5 Nm)
Head Torque 140 lb/in (16.0 Nm)
Alternator Specifications
Alternator 494254
Type DC Only
Testing RPM 3600
DC Amps 1.2 adc
For additional information regarding this engine, I recommend that you talk with an authorized Briggs and Stratton Dealer for engines. Briggs and Stratton Diamond Dealers have a Master Service Technician on staff.
Dealer Locator
http://bit.ly/2AwHCu0
To order online or get part pricing:
https://www.briggsandstratton.com/na/en_us/shop-parts.html
If you have any further questions, please feel free
to update this e-mail, or call Briggs & Stratton Customer Support at 800-743-4115, M-F 8-5PM CST.
Regards,
Nancy
Briggs & Stratton Customer Support"