Pressure drop is easily solved with pipe size. My guess is installer was being lazy and just wanted to unroll 100' of flex and charge you. Pool heater here was plumbed with ~1.5" pipe. Decent run and 250k btu IIRC. Lots of pressure available (iirc 10" into regulator and 5" needed out of it).No clue, but I remember very well the discussion as that's where I originally wanted it.
'I can do it, but your pressure will drop a lot and you won't get much heat out of it, your money so you decide'
I bought enough JH siding to clad the house and shed so they're identical. If there's enough left over I may build a bbq station for the smoker.
The other option that is sometimes done is a high pressure supply line and local regulator. That is how they deal with standby generators that need a bunch of gas in some parts of US. No idea if anyone does this in canada.
If you want the thing as a focal point, go ahead but I dont see a huge upside to a smoker in a fancy shed. It is a long process with minimal attention required and if the weather is bad, I probably wouldnt cook that way. Bbq being snow free with no cover to remove and with a roof to protect me from rain meant it got used about once a week or more year round. Current system with canvas bbq cover means it gets used twice a winter. Smoker sits in the back corner and only gets used in the summer here.