You’re suggesting saving a fixed amount, which is bad for the reasons I outlined in the comment you responded to.
It's only bad if you poorly estimate your minimal expenses over a long term.
If buying a PS5 is really important to you, then by setting money aside for it you are paying yourself first. For most working people, though, there are much more important things to save for, and the wiser decision would be not to buy the PS5 if it means reducing the savings.
My approach:
1. Put a reasonable amount in savings first, but make sure to leave yourself enough to enjoy life, because you can't be completely sure you'll be alive in 1, 5, 10 or 20 years.
2. Spent on monthly expenses without stressing about savings, because some fun money is also part of your budget.
3. If there's any money left over when you get your next paycheck, send that into savings as well.