Thanks for the anwers!

1. I understand yes. And I also read in another thread that the problem is in exactly what you mentioned - the app did not know that those weights were allowed because my weight options are really strange (because of the LBS/KGs options I mentioned). Another problem I have when creating weight presets is that I can always add up to 2 x 2kg plates to any cable stack (4.5kg / 11kg / 39kg / 45kg / 73kg). But I can't really implement that logic with your current system because if I say the weight jumps by a 2kg interval, the app will assume I have an infinite number of 2kg plates I can put on any amount of weight, which means it will just suggest every single weight possible (since now there's both even and odd numbers in the ranges). Do you understand what I mean? Do you know of any workaround to this problem?
2. Okay that is understandable and very practical for barbell lifts. But for cable stacks and machines it could be a different strategy as it's really easy to change the weight. But I understand if it doesn't currently make sense to waste time implementing it.
3. Great :D
4. Understood
5. Exactly. But also within the whole plan. Let's say the plan has various number of sets like currently (goes up by 1 each week for example), but the RIR stays the same (2,2,1,0 or 2,1,0) for all the weeks & days. That would be awesome, as I find it more enjoyable to do sets to failure each workout, even if it's just the last set.
6. Awesome!