Who are the people talking about you need to save and re-load every fight for Tactician? Lmfao, that is 100% untrue.
I've beat the game on Tactician (not solo) with just a party of 4. Using no pre-buff or pre-fight cheese and just good itemization, I didn't lose any fights or have not to save spam at all. The fights are so easy in part because Larian has enemies in Act 3 with 11 AC, 13 AC and low high points.
The enemy AI is dumb with their turns still too. So many pointless Misty Step or teleportations for small distances, running into AOO for no reason just to run back to initial spot, poor tactics, and bad enemy design.
You do not need to save spam at all to beat the game in Tactician nor do you need to spam long rests.
If anyone is talking about they beat Tactician but they long rested after every fight or spammed save, then they're not really at Tactician level and used that as a crutch.