It’s Code.
FAC - flexible appliance connectors are known in the industry as corrugated stainless steel connectors (CSSC). It seems like someone is trying to make things confusing.
Bends will reduce the gas flow. Very sharp bends could weaken the tubing.
Corrugated Stainless Steel Tubing (CSST) & Flexible Appliance Connectors (FAC)
I agree most home inspectors probably don’t read the installation tag on the appliance connector.
If that PEX discharge piping is installed in a jurisdiction that follows the IRC, the pipe tubing diameter will need to be increased to 1 inch.
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They insulated the pressure relief valve discharge piping, but neglected insulating the brass piping material that is connected to the water heater. That’s a first for me.
I don’t see a sediment trap on the fuel pipe either.
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Those are one hell of a bend radiuses. More that 1-1/2" to 5" inch. RECOMMENDED BEND RADIUS Z 3 IN FOR UP TO’ IN CSST AND a 5 IN FOR 1 TO 1 YT IN CSST
RECOMMENDED BEND RADIUS a 1 Y, IN FOR FLEXIBLE APPLIANCE CONNECTORS.
Posable weakening the tubing.
Looks like it was reduced from the required 3/4” size
If you allow it, you had better inspect it all the way to the end of the pipe.
If it does not slope down hill to the end (droops in the flexible PEX hose), water can freeze in the line which a blockage could make things go boom.
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But, but… it’s a plumbing drain, and they are supposed to have Traps, right?!! 
They are class action suits by plaintiff attorneys trying to get the next big pay off! Most PEX issues have to do with the fittings and some have been with the pipe itself. Every single plumbing pipe has problems. We went through copper and pin hole leaks in the 1990s and early 2000’s and now they are trying to do a class action on 50 year old Cast Iron pipe! PEX has been in the USA since the mid to late 1980s and in Europe since the early 1970s.
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Oh yea! Pay no attention to the air gap thingy, either! 
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there are new cases in motion now about PEX. similar to PB,
In my area they are even allowing PVC…Which probably is reasonable since the “Watts” prefab pipes are made of PVC. Not CPVC from what I can tell from the research I have done. probably 50% of new construction in my area are using PVC (just depends on the “Licenced” plumbing contractor). The few times I have called it out, I have been shot down as local code guys are allowing it one that I talked to even mentioned the “Watts” made for TPR use as an example. So I’m not willing to argue the point anymore.
Any links to the “motions” so we can see what they are about?
Last year I did an inspection for an engineer involved in a legal case. He showed me his evidence of failed PEX less than 5 years old, but asked that I not share it until the litigation is complete. He still hasn’t given me the green light to release the information. Keep your eye out for discolored or hairline cracks in PEX. 
Let me guess… it was exposed to UV rays/Sunlight!
I have noticed the increasing issue of this exact problem. Have rarely seen it over the last 20+ years.
I am positive it has everything to do with FLIPPERS and DIYers in the COVID age!!
Sample a couple of weeks ago:
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$3 would solve the problem!!
Actually these were large commercial buildings in several different countries.