The phrase "substantive issues" refers to important and meaningful matters or subjects that are significant and have a real impact or consequence. Full definition
I have been very impressed by his community organizing experience and thought that he ran an excellent, positive campaign that focused on substantive issues facing our district. (queenscampaigner.com)
Many of these are about relatively minor breaches, but a good deal more address substantive issues that result in serious action. (remonline.com)
You will gain valuable insight and useful knowledge in the procedural and substantive issues surrounding many areas of law. (thebalancecareers.com)