One of the most valuable life lessons is you can't get anyone else to care about what you want them to care about basically ever. You need to focus on the things you can control and one of the things you can't control is what someone else is going to care about.
So if you want something done and someone else has to agree, you have to figure out how the thing you want coincides somehow with their interests and concerns.
Then you explain the thing you want to them in terms of how it advances/affects the interests and concerns of the other person. So in the framing of TFA, product are never ever ever under any circumstances going to give a shit about your architecture proposal (because that is entirely in the domain of your concerns). But they may care about how the architecture is going to prevent them from delivering features that are on the roadmap coming up and how you have a solution that can fix that for example (because now you are in the domain of their concerns). Notice this is not just "your architecture proposal", it is how your architecture proposal is going to get them what they want, and if you want to do this you need to think deeply and make sure you really understand what they want, not just what you want.
You're not trying to change their mind. You're trying to get what you want by showing them how it will also get them something they want.
I'm putting this here because I really wish someone had told me this 25 years ago near the start of my career.
So if you want something done and someone else has to agree, you have to figure out how the thing you want coincides somehow with their interests and concerns.
Then you explain the thing you want to them in terms of how it advances/affects the interests and concerns of the other person. So in the framing of TFA, product are never ever ever under any circumstances going to give a shit about your architecture proposal (because that is entirely in the domain of your concerns). But they may care about how the architecture is going to prevent them from delivering features that are on the roadmap coming up and how you have a solution that can fix that for example (because now you are in the domain of their concerns). Notice this is not just "your architecture proposal", it is how your architecture proposal is going to get them what they want, and if you want to do this you need to think deeply and make sure you really understand what they want, not just what you want.
You're not trying to change their mind. You're trying to get what you want by showing them how it will also get them something they want.
I'm putting this here because I really wish someone had told me this 25 years ago near the start of my career.