This is very circumstantial since you'll want to keep up with government for ideas, production and trade for buildings, and navy once you actually have a need for a navy. While I agree, yeah, allocating a majority of your research points to one tech (land) is a good idea, it's not a blanket rule.About this one - I'd rather suggest using the AI method - put all of your money in 1 tech section (leaving some to minting if needed), that way the research is WAY faster and you can allocate all that money to another sector or higher tech level quicker, without having the slow-ass steady build-up of every tech level. It's very slow and ineffective to research all at once (well, in the end the result is same, but you can quicker unlock a specific tech's bonuses by pouring all the money into it and then go to other techs from highest priority to lowest so you can get all your needed stuff as early as possible).
Also, that isn't what the AI does. The AI allocates a huge amount to minting to the point that it will have 30 inflation at a time and will be several techs behind in everything as a result. It makes itself dependent on minting in such a way that by 1600, you should be ahead of France of Spain, even as an Eastern European state.