There is nothing wrong with planning and progression. However, it is rarely going to work out that you do exactly 2% each time. Progress isn't always linear because life gets in the way and there are so many variables that can affect the outcome of a workout.
Without supplements a beginner may make a 10% jump once or twice, but that type of jump will quickly become untenable.
For example, a beginner squats 75 pounds for 5 sets of 5. It is very likely that due to becoming more coordinated and neurological adaptations, he/she could do 82.5 (10% more) the next workout and 91 pounds the 3rd workout, but that won't last.
James 1:16-17 ESV
Do not be deceived, my beloved brothers. Every good gift and every perfect gift is from above, coming down from the Father of lights
With God's help...Mens sana in corpore sano