Farms used to need manual replanting all the time and it was a huge pain, but a quality-of-life update fixed that. Please do the same for units. For example, make queuing a villager with a middle-click cause that TC to produce villagers indefinitely, provided that there is enough food in the bank to proceed with each next villager. I doubt this would change play at the highest levels, but it would be great for me (and probably lots of others) when I get attacked early on and forget to keep queuing villagers as I fight back. Like the auto-replant toggle, players who don’t like the feature don’t have to use it.
Right click like in AoM can be easily implanted.
The general opposition to the idea is that it would take away a major avenue of skill expression. There have also been numerous mitigation ideas suggested, each with their own pros and cons. In short, it would not be liked that much, and there’s not really a way to avoid the disaproval.