I feel this is a misinterpretation. You are omitting my clarifying systemic vs cosmetic changes. It's only reasonable that a cosmetic change may have little to no systemic impact, such as changing the term "Strength" to "Might" for example. The systems still work the same. Changing from a Stat that leads to a bonus to just a bonus is mostly cosmetic. It's removing a step. Pruning unneeded elements can lead to a tighter game. The advantage to a tighter core game is that you can later add more elements onto it. If your core system already has unneeded bloat, when you add more systems, you increase system bloat faster.
Furthermore, while I am advocating for discussing this, you are mistaken in your assumption that this change would be my goal. I am just examining.
Finally, if we only keep a system because it is a sacred cow, yeah, cut it. Edition changes should be reevaluations.
I don't think there's much of anything inherently unique to D&D that some people wouldn't label as a sacred cow. Whether that's HP, HD, AC or ability scores. Tons of games have come and gone (not to mention editions of D&D) that got rid of some of those traditions.
No game is perfect for everyone, it's impossible. But 5E did a decent job of threading the needle of adhering to tradition while still maintaining the "feel" of older versions. There are many reasons it's the most popular TTRPG, keeping around some of those traditional cows is one of them.