Well, I agree that with fewer things to go wrong, learning is easier. I started with a 2 cavity Lee mold, a Coleman stove, a stainless steel pot a slotted spoon, a Lee ladle, and a mallet. That's about bottom line for casting bullets. I cast bullets with this set-up for nearly a year, keeping my .44s fed, before I got an electric pot.
Mold temperature with a 2 cavity mold is a bit easier to control and making enough bullets won't turn into drudgery. I have an old Lyman 429421 from the '70s that casts an excellent bullet, but it's a single cavity and it really takes a "need" to cast enough bullets outta that mold; slow! One of my favorite molds is a 6 cavity, and the pot empties quickly so I gotta keep my eye on that and the pile grows rapidly, but I've been casting for quite a while and watch my bullets closely to check for cool cavities.
Best for learning, IMO, is a two cavity; easy to handle, easy to control temp., and makes enough bullets each session.
Nuttin' wrong with Lee molds, I have 8 of them and even though Lee molds have a different "personality" than my Lyman molds, I get a lot of good bullets from them. I too am looking forward to a premium, semi-custom mold, but for now my present molds keep me well supplied for 7 different calibers.
I've often heard it said
"The only way to learn to cast bullets, is to cast bullets", so when yer pot comes in, get casting...