1. No electric tongue jack.
No big deal - I bought mine on Amazon and installed it myself
2. No water heater bypass.
I have one and never used it - again no big deal
3. No black water flush inlet.
I've never had one - so I don't miss it.... I usually fill my black tank with 5 galls of water before leaving, let it swish around on the drive to campsite and empty it when I get at the camground
4. Roof is rubber with walk on joints.
I've had 3 campers with rubber roofs - never had a problem - just remember to maintain it every year or two.
Gerry