First of all this model has 48 (!) different antennas on 16 radios and works with both 2,4Ghz and 5Ghz radios. Not really a comparison.
Apart from that, a MikroTik router also is allowed to have up to 2007 clients associated, in one radio in one frequency only!
But that is actually useless information. In both cases it just states what the software has as a limit in the amount of associated mac addresses. The register (=memory) can't handle more mac's.
The moment some of these mac's start generation traffic the whole thing collapses... (well, to start with, you need now the same memory for other tasks as well, and a very, very powerfull and very, very fast CPE to do it all.And still, in a AP-client network the time is a shared medium. If many are demanding a chunck of the second, there is nothing left for others. You can only send so much data in the same second, no matter how powerfull your setup is. Time = time.
Google a bit around and see how the real experts are dealing with concert halls, concerts or congress auditoriums, football stadiums etc. where you see hundreds or thousands users that all have wifi devices and a portion of them also use it.
They use very small cell wifi. Meaning each antenna will only serve a relative small group of users (the size of the cell depends a bit on the usage; On a open air dance festival the usage of the average connected client is different than a 1000 man big IT symposion where Apple promotes their latest product line..)
So, all these AP (tenths up to over hundreds) are all to be wire connected (or with a 5Ghz backhaul mesh network) towards a central controller router to manage and steer all clients and their traffic.
You are talking big stuff now with lots of dollars involved and at least some very skilled persons to set it all up.... Persons that can really call that "wifi is their world".
Thinking you can serve hundreds of users with only one or two AP's is just something unreal...