[1.15.2] Should I use tags for functional features

[Busti]

I am creating a conveyor belt block for my mod.
There are supposed to be several different blocks that can connect to Conveyor belts, including different types of conveyor belt blocks.  
Should I use Tag<Block> to check wether an adjacent block should be connected to a conveyor block? Or are they supposed to only be used for cosmetic purposes?  
Should I use an interface and instanceOf checking instead? Or should I use a custom lookup system, i.e. a static Set of blocks that are supposed to connect to a conveyor?

I am not asking about testing for the presences of an inventory, conveyor blocks are not supposed to connect to inventories.

[Draco18s]

Use tags IMO. Rails do, fences do.

[Alpvax]

The only argument I have seen for not using tags is within forge itself, and is due to it having to retain vanilla compatibility (the tags wouldn't exist on the vanilla side).

I personally use tags as much as possible for my interaction, as it allows compatibility to be added between mods far easier (just add to the tag).