I read that comment and initially had the same response as you. But on re-reading it is good advice, and one shouldn't focus on edge cases in language, when IRL we would probably all be in furious agreement.
Obviously for most models it is simple to adapt to variable simulation periods without instability, either by microstepping (which commonly occurs anyway because the natural simulation freq is much faster than 60Hz), or because the process is just solving a stable DE or doing basic physics over a different period.
For debugging it is often much easier to run physics at a fixed rate. You do get different results at different rates due to numerical precision issues and error accumulation.
Obviously for most models it is simple to adapt to variable simulation periods without instability, either by microstepping (which commonly occurs anyway because the natural simulation freq is much faster than 60Hz), or because the process is just solving a stable DE or doing basic physics over a different period.
For debugging it is often much easier to run physics at a fixed rate. You do get different results at different rates due to numerical precision issues and error accumulation.