Maybe its just me but I feel like its a huge oversight to not have all toons be up to speed on the campaign.
When you level your next character you should either choose to level through the campaign or choose another way. If you choose to skip the campaign it should bring all characters up to speed on the campiagn. This way characters arent missing from certain areas. For example I cannot do the Sojourner of AK on an alt right now because a character is missing due to my alt not doing the campaign.
Once a toon picks their path they should be phased accordingly to match the completion of the campaign so this can be avoided