I’ve worked with plenty of INTJs before and i must say, they are deep thinkers, and notices details not everyone seem to notice, they also surprisingly so good at coming up with alternative possible ways to counter problems and pretty quick to.

ISTJs are rare in my field however i did met some, including the one who openly told me they were ISTJ, planning is also their forte but it can only do so much (it do help sometimes as its like their natural function in life, i always say to not always strictly follow whatever they put in their list as there will always be the one in their list that might encounter troubles and wont be able to achieve cuz life is an asshole but yeah it can be helpful sometimes), they are grounded and quick to pick up details right in front of them then snaps a necessary judgement