I think the arguments are serious.

Taking cans and hives - for me, this is also part of the game and strategy. The ability to take them as early as possible is also a skill.
On which week will the Dragon Utopia be taken without cans and hives? Again - it's dragging out the game.
We'll end up reading reports like:
"The opponent was given an external dwelling of elves" or "on 112 I'm capturing my own secondary, decided not to continue :D "
Such "accidents" will start deciding the game.
Random is random for a reason: you play what the computer threw together, that's why we love it! If you want perfect balance - play fixes!

Added after 1 minute
And one more thing. Play about 10 parties with a ban on cans/hives and write your impressions of the game. I think many will agree (especially those who suggested this before)

My god, why even take those miserable hives on the 2nd week; for most Castles, even the max is easily taken. With cans, there might be trouble on 2-4, but their presence is still more important than the difficulty of taking them. Not continuing with a native secondary? Nonsense. Often it's hard to build up just one Castle and then buy out troops from it, and as for a second one, it's simply unreal without a huge amount of money. It's hard to get through that troops still need to be built and bought. Furthermore, in many parties I've played online, cans\hives were either not distributed or weren't taken in time, and it was quite interesting, at least for me. Therefore, the objections are not serious.

Added after 4 minutes

Not without that. And you're also being very rude.

Firstly, you are the one being rude, and people have already told you about it. Secondly, if you're some kind of glamorous St. Petersburg intellectual, then come on, address me using "вы".

Added after 1 minute

And in general, some swamp would still have to try and take those cans from their own respawn; you'll get tired of transporting those angels :D

What do you mean "transport them", it's not that hard, although for the swamp it is one of the necessary limitations, I think