While this is better than not working out at all, the only way you're going to get your muscles to grow is by progressively overloading consistently over time, and if you have too many sessions where you aren't pushing more weight or doing more volume than the previous session, you'll be leaving a lot of gains on the table.
Yeah, you’re right of course about progressive overload being necessary for gains. You don’t need to count reps every workout to achieve it though. If you listen to your body and go to form breakdown, are consistent, and eat/sleep well, both the number of reps and weight you can do will naturally go up over time. It’s not at all linear though—depending on biorhythms, there will be ups and downs in the short term. My point is mainly not to sweat it on the many ‘off’ days when you can’t get a PR or might be well below. These are a normal part of the process. The important thing on these days is to just put the work in.
