Hello. Thanks again for everything!
Sorry to bother, but I'm just wondering, have Advanced Assembling Machines never had the +50% productivity? I swore they did, since the advanced chemical plant and advanced furnace do. Am I on crazy pills?
Or can this be a new optional setting that can be added? It's a lot of work to crank out these advanced machines, so seems balanced if someone wants that setting on...
Just thoughts. Thanks again!

Advanced assembling machines never had +50% productivity ,they are already very good and applying+50% prod to everything would be op. But if you want it in game you can make a mod to for that.

Thanks for getting back to me again. Always appreciated!
I'm new to modding. Would a mod like this be complex? If you have points about where I could go to learn more about making a mod like this, that'd be great. How long does a mod like this take to make?

You only need to create info.json file and add dependency for k2so , then make data-updates.lua and add data.raw["assembling-machine"]["kr-advanced-assembling-machine"].effect_receiver = { base_effect = { productivity = 0.5 }},
You can find more info about modding on factorio wiki

Thanks man! I poked around a bit, watched some YouTube. Got confused and ultimately what I did was go into your prototype directory and add the "effect_receiver" line to the advanced assembling lua.
Probably wasn't the best way, but it did work! I felt clever. This isn't my wheelhouse at all, but surprise!
I appreciate you responding. You are a great example of what makes this community amazing.
If you anticipate why my approach is going to be a problem (perhaps I'll have to update that lua every time you patch or something? Feel free to let me know the drawbacks of how I approached it. Haha. Take care you hero.