I just do light weight nowadays with my strength training. It’s easier mentally. Rather than push myself to go higher on bench, squat, and deadlift, I stick to 1 plate for bench and squat and 2 plates for deadlift. Every single time. Instead of increasing load, I increase rep amount and focus on my form. Honestly, I still find myself sore after most workouts and the simplicity is nice. I’m 25 for reference.
1. As a young male, 1 plate bench/squat and 2 plate deadlift is extremely weak. Please strive higher than this. Anyone can achieve this in 6 months of intelligent training max. Many men start this strong untrained. The majority of young men can squat 1 plate untrained.
1. Soreness is not an indication of anything other than that you did a lot of eccentric loading. It doesn't correlate to progress. It is also a sign that your programming is not intelligent; you generally should not be sore after the first few workouts ever again.
1. Yes it is easier mentally, in the sense that doing easy things is easy. This is not a benefit, because doing hard things results in mental strength as much as physical.