That's a loaded choice/statement. But I get that you dislike both the old and new. With this current system players sometimes need to modify both their Invade and Defend team more frequently than days past, and change make people uncomfortable.
As to balance. I think the Gems team does fairly good job. They need to respond quicker to obvious OP troops. But I'm sure its a challenge balancing the across the various level of players and against the myriad of abilities, traits, including interaction with other troops.
After all, if big AAA games with hundreds and hundreds of employees, and 100-500 million dollar budgets still hardly ever get game balance completely perfect in a quasi static game environment. How can one expect a small team to do it flawlessly when constantly adding new troops every week and changing the interaction each month with a newly introduced ability (like adding 'frozen' or 'stun' or 'x').
Final note: In one of your posts you talked the meta slowing your play. Obviously I don't have any metrics but I wonder what the actual average battle time has been month over month for the last few years. Cross referencing with average reward payout per battle or hour of play. I personally believe we see more rewards now than a year ago, and even more rewards than the 1st year before that.