You put it like you need a huge amount of weeks (maybe a month) to farm points for a class change, when in reality you might have enough points in 2 weeks or less (it depends on your resources) for 1 class change. And it is not like those contents are a waste, they are part of the endgame content that can give you silver/equipment. You can keep on developing your character and farm those points. If you don’t want to do that, then pay, this is how mmorpg industry have been for a long time.
For the class points being bugged: maybe we gonna start seeing those bugs now because we just left a moment we didn’t need to farm for them. Time to report what we see now.
About the Tree of Alts and the same argument of Blessed Shards / Gems that everybody does: yes, you have better options to farm shards/gems other than keep on doing saalus with more than 3 characters for just 1 shard each. This has been prooved several times in different threads here in this forum.