This is a complex matter, in my opinion… I say this as someone who used pods exclusively for almost 5 years.
Certainly, we can consider the process a hobby; the result of our own work can add extra flavor.
There are many types of wire and cotton, and their combination can be used in countless variations, which truly makes vaping completely customizable!
A single coil head can only be used for one flavor, whereas with an RTA, you can switch to the next flavor with just a cotton change.
Of course, building your own coils is significantly cheaper than buying pre-made coil heads.
There’s no dependency on whether coil heads for a particular pod will remain available. Either production ceases, they modify it… or the supply source simply disappears.
That’s all I can think of right now.