Remember that teams will only be allowed to work on their 2026 car from the start of 2025 and new regulations aren't even finalized. Red Bull will be developing the aero without Newey, and are working on the new engine without Honda. Some exciting times coming, hopefully.
I think its never fun to have any dominant team ... Even if you are a fan of that team. Its great to see your favorites win, but it blows if there is no real competition or turns into teammate death match. Seeing great teamwork and seen close competion is way more fun. 2021 season was quiet fantastic to watch (except end of that last race).. 2022 was kind of nice too as there was hope and tems moving around, but 23 was a lost cause at the front and 24 seems to be repeat of 23...the midfield was alot more fun in 22/23 as well but not so at end of 23 and 24 it seems there is alot less going on there...
No, you can't stop engineers from testing aero in their heads, but I would imagine teams are required to keep logs and documentation of development work/wind tunnel time/computer simulations for FIA to inspect at any time. It's nothing new either, each team has a wind tunnel time and CFD allocation per season, and there's no development allowed over the summer break. I suppose in the end you have to trust that FIA is enforcing these rules properly, but you can never know for sure.