Ski party, your roster mostly 3*, balanced 3&4, mostly 4, 4/5?
I used tc2/3/4 to use ad kits and prc swrds to bring my mostly 4* heroes up slowly. Developed a raid atk/def team while largely ignoring most of them. Then came wars and vip.
Rushed one tc to 12 while pushing the sh hard. When sh got to 17, I left tc12 alone and pushed second tc to 19. Still using tc4.
Getting enough iron to keep moving sh and tc was tough, but raiding was good. Ham was never a problem. Recruits were at 6-8 and the recruit II quest.
The millions of hams stored in tc12 fed tc19 so fast, my worry was ham for levelling and ascending.
Simply, I found this approach more practical. I had no need for 3s. This is now true of not needing to run tc20 since I pay to play to an extent.
Buying gems near the events is cheap. I will do a couple 10x rolls. If I am unlucky and need little fodder for new heroes, then I will run tc20.
Just a different approach.