Is "anupassi" translated as "focused" accurate?
Anupassi is watching (by understanding) continuously.
You can translate into many words because when mind arising, there are many mind factors arising together with each mind.
However, according to each Sutta's context, the selected words are the most proper words for that Sutta.
For the example, Anupassi in DN22 MahasatipatthanaSutta.
Anupassi in that Sutta has many situations, many objects, etc., so Anupassi is the conclusion, Uddeso, of the whole  comprehension styles in DN22.
Anupasī is including Viharati, Ātāpī, Sampajañño, Satimā, Vineyya, Pajānāti, SatiPaccupatthitā, Nāna, PatisatiMattāya,Anissito, Na Upādiyati, SampajānaKārī, Paccavekkhati,  Upasanharati, Ariyo Atthangika Maggo, Sammāditthi, SammāSankappo, SammāVācā, SammāKammanto, SammāĀjīvo, SammāVāyāmo, SammāSati, SammāSamādhi, and every word in it's explanation such as Vitaka, Vicāra, pīti, concentration (focusing), etc.
You can see that if you want to translate Anupassī in DN22, you need to translate all of those words together, however you can't. So in this case the translation which is same as in Pāli is better, except you are the Tipitaka Memorizer who teaching one who is going to enlighten immediately. In this case, the proper words for that enlightening person are allowed. However, they need to get back to the original version in Pāli after enlightened to keep Buddha's teaching to 5000th B.E.