Why beginner mistakes on a tight budget

I want to write something more comprehensive about this later but starting with a quick post to gather thoughts. Been thinking about this for a while and curious what the community thinks.

The trade-offs here are not obvious to me and I keep flip-flopping. Mostly thinking out loud — feel free to push back hard. Not sure if this is the right place to ask, mods please remove if it is not.

Not sure if this is the right place to ask, mods please remove if it is not. Posting this here because the relevant subreddit has gotten too noisy lately. Quick context: I am relatively new to this and trying to find my footing.