1. You don't have to go back and forth, it's up to you how you want to play, that guild may need some changes, seeing when it came out there were Pet Map Reset codes that are no longer active (they should of had a infinite time limit this would cover new players too).
You want to push once when you fist get arena as far as you can, but for new players they well most likely only have a snake that is lvl 5-9, so they well only have 6 nodes (once they unlock their second pet), they well not need to change to an arena build because they can not. You need a minimum 7 nodes unlock to get to an arena node (pet Bat and soon as you get past your first ascension get you second pet snake that well equal 9 nodes). As for you, push once in arena, with only your arena nodes lvled up as much as you can, then make an idle mode, you don have to push arena again until you think you can kill 3-9 (this number changes as you lvl and get higher in arena) more arena opp. which could take a few months.
2. As stated many times before, there well not ever be a "build save mechanic" for any of the resettable upgrades (ascension, trophies, and pet map). Seeing as the builds change anyways as you lvl up and get stronger you would have to change it.
You want to push once when you fist get arena as far as you can, but for new players they well most likely only have a snake that is lvl 5-9, so they well only have 6 nodes (once they unlock their second pet), they well not need to change to an arena build because they can not. You need a minimum 7 nodes unlock to get to an arena node (pet Bat and soon as you get past your first ascension get you second pet snake that well equal 9 nodes). As for you, push once in arena, with only your arena nodes lvled up as much as you can, then make an idle mode, you don have to push arena again until you think you can kill 3-9 (this number changes as you lvl and get higher in arena) more arena opp. which could take a few months.
2. As stated many times before, there well not ever be a "build save mechanic" for any of the resettable upgrades (ascension, trophies, and pet map). Seeing as the builds change anyways as you lvl up and get stronger you would have to change it.
IGN: Mythic Guild: Chaos