The 2022 rules cycle has been dominated by Max Verstappen and Red Bull, but behind them teams have gradually closed up, with 2023 one of the most competitive seasons in history in terms the lap time differences between all 10 teams.
Heading into the third year of stable regulations, Stella believes teams will start encountering "diminishing returns" on aero development after two years of spectacular progress up and down the grid.
"I think this year, we will see that adding lap time will start to have some diminishing return, I would say, for the first time with this new regulations," Stella said.
"For two years we have seen progress, especially aerodynamic development, being quite steep. But now, I would anticipate that towards the end of the season, it will become harder for designers to be able to keep a very steep development rate.
"This is why as I said before, that we can be competitive if we are able to keep the development rate that we have experienced over the last 12 months."
Source: Autosport