Not realistic to maintain control past A unless you built a real rocketship. The board doesn’t usually want to run your company - they have enough other companies, some evidently better than yours as they don’t require this intervention.
I’m not sure where that’s coming from.
Also plenty of companies out there have control past the A.
And in the best case it’s just one series A taking ~15%, thus founders still have 85%
Equity ownership and voting control are also different things. After the B you commonly have 2 investors and an independent director on the board, alongside 1-2 founders.