I also would like to point that random units at capital will enhance the advantage of starting, which is already significant. It is one think dealing with light infantries and crows, it is different when Wizards start running around at turn 4 or a Gryphon-Hero combo hits you at turn 5. The only units that is acceptable are crows and scouts, they could be the standard units at the cities.
I also would like to re-emphasize a ban on starting units on some maps. Part of my "Reduce The Starting Advantage" campaign. I think these are the units that should be banned as a starting unit
Starting Unit Ban
Wizards on land games
Sand worm on desert maps
Yeti and Mammoth on Snowy maps
Flyers on sea games.
Should be banned as starting units.
We should do everything we can to slow down the first player or the starting team.