I totally agree with. I am pretty much targeting specific account that usually engage with niche specific content. F\uF is typically done to reach an engagement that can make your posts to explore page, other than that I agree with you its not very practical and can lead to worse engagement if they were not engaging at all.Its really nice you are trying to help but then again these type of information is what led to the current state.
Its important to stop thinking that achieving big following numbers in days is the route to making it on IG, all the information you have provided will only make people do the same mistake of choosing quantity over quality.
No matter what niche (unless its not that widely talked about on social media) should aim for 30% follow back ratio.
If you focus on who exactly is following you back you don't really have to waste your time following 500 people please make efforts on making quality follows of 200 or so.
If you do that you can handle many accounts.
Even F/UF should be used to only get the account off the ground in the beginning and then later on try and post content similar to the big accounts in your niche, Use a combination of hashtags the big accounts use and post frequently. The account will grow organically if things are done right.
I am planning to stop, as with my other accounts I grew before, when reaching aroung 1500 followers where you can expect aroung 600+ likes on your posts, a potential push to the explore page.
Thanks for your insights,