What's with the huge typeface? Kind of blinding...
>Is it necessary to have a follower board in your hive and move it along as the hive grows?
No.
>I know it is helpful if you are starting a colony in a TBH without any comb, the follow board gives them some guidance on comb direction.
Perhaps. But it also limits the space they have to heat and cool and guard.
>After they have several combs being formed in the right direction, can you remove the follow board and let them continue on?
If I ever bothered to make one, I would use it a lot especially on a colony that is small and building.
>While they are expanding their comb, I add empty bars inbetween full bars to keep the comb straight. That is why I think the follower board is kinda pointless. Am I missing anything?
Yes. It's really about managing space. But you can do fine without one at all.