These are opinions about upgrading, from xet7, maintainer of WeKan Open Source kanban https://wekan.github.io
xet7 thinks, that it is good to keep using current frontend and backend frameworks, upgrade them when possible. If there is any problems, ask at https://forums.meteor.com
xet7 thinks, that upgrading to newest Meteor 2 and Meteor 3 is being made more easier all the time, when new dependencies become available, any bugs are fixed, etc. So it is good to make all possible upgrading steps available.