The 750 appliance might be 6 years old but it was still being sold ~2.5 years ago when I bought it brand new from an official Checkpoint reseller.
The freeware firewalls like OPNSense & PFSense suffer from lack of operating system hardening; lack competitive modern features of the leading commercial firewalls like Checkpoint and generally don't come with rapid updates to exploit protections.
The pricing data in the Screen Shot on a post below shows how pricing ramps up dramatically as device bandwidth and user count increases - this is clearly a business pricing model coupled to more employees requiring more bandwidth to generate more revenue.
A home user / SOHO user is really quite a distinctly different market segment and includes people with a wide range of skillsets.
Checkpoint addresses this market with simple easy to use appliances built using quite low end hardware that is mismatched to the capacity of modern domestic fibre internet connections.
I think this is an issue because I want to be able to securely use all my internet bandwidth ( movies, gaming, offsite backups, security camera feeds, downloads ).
One should note that a home firewall can take a real hammering across a gigabit fibre connection if someone with a botnet decides to be a nuisance or tries to break.
Instead of always selling a home user relatively low powered appliances plus software, perhaps Checkpoint should offer a software only option so a home user can buy suitable industry standard hardware that will handle their workload and throughput expectations.
The benefit of this model is Checkpoint gets more software revenue (much higher margin) and the user is liberated to get a compatible robust high performing hardware platform while enjoying great security. Borrowing your metaphor, the Mercedes firewall software can be run on hardware from VW or BMW or Bugatti.
Hopefully someone from product development / marketing will pick this idea up !