Let´s say I’m going to dig deeper in the gospel of Mark.
At first glance, there are about 130 Commentaries on Mark around - only in English language! About 15 more will be released sooner or later (in English).
I’m not even considering essays on special topics.
Is there anyone - professor, scholar, hobbyist… - who has a meaningful overview over all that is written? There is John Dyer’s website, yes. But frankly, who ever writes a new commentary cannot (or can?) take into account what others before him/her have come up with? Won’t that lead to re-invent the wheel various times?