When it comes to weight and resistance training the most important thing for me is to avoid injuries and make my training sustainable long term. I just can't afford to be sidelined by injuries and burnout...I train with enough intensity to make progress and maintain what I have but not so hard that it leads to injury, exhaustion and burnout.
It's not fun to spend 3 days in recovery because of doing heavy leg day or tweak your back because of heavy deadlift day or suffer shoulder injury because of heavy bench press day... If I train today I want to be recovered by tomorrow and I don't like to have pains, aches, severe DOMS to interfere with my daily activities and responsibilities.