It raises a good point actually. With these reg changes every X number of years, how much extra cost does this cause the teams in terms of developing a new car vs the actual savings the very reg changes are designed to make themselves? I would hazard a guess that the extra costs in man power, materials, R&D is going to outweigh the savings from the reg changes, or do they factor that in?
Unfortunately when 2021 season happened it was a perfect storm of various factors allowing such a closely fought season. Probably too many to go into here, but essentially the 2022 changes were baked in from years before, so teams can plan for it. The FIA could not suddenly turn around at the end of 2021 and say "ah guys 2021 has been epic, cancel all the reg changes and carry on" as much as that would have been cool. The teams will have already started work on the 2022 platform and adjusted budgets/manpower/R&D accordingly for the new reg period.
It's possible that 2025 - the final year of this reg period - may become a good one if other teams are able to catch Redbull. Time will tell really next season. There is a fear - as already mentioned above - that budget cuts will make it even harder to catch the top team during each phase. If by the end of 2024 season next year teams still look a way off Redbull, we could even see a walkover during the following 2025 season, the final season of this reg period. Teams may write off 2025 entirely as they focus on trying to ace the 2026 reg changes with the best base platform, since there will be more gain in focusing on that rather than throwing everything into 2025 and hampering potentially years and years with a lacking 2026 car. It's a difficult balance. Right now I think things are ok. There is plently of time to catch Redbull during this phase even if they are sand bagging.