Why is the ESCI Web of Science indexing level not equivalent or on the same level as Scopus indexed journals?

 Dear Academicians,

I found out Indonesian REGISTER JOURNAL states on the web https://journalregister.iainsalatiga.ac.id/index.php/register/index that it had already been indexed in ESCI Web of Science: https://mjl.clarivate.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=1979-8903 but there is one big question in my mind: Does the indexed journal in ESCI Web of Science belongs to Core Collection of WoS?

There are two different stances on these Questions among my fellow academicians in Indonesia. On the one hand, some people think that ESCI WoS is just indexing for the middle class like DOAJ, EBSCO, ASEAN Citation Index, and some even say that ESCI WoS is "half-hearted" indexing that has not yet entered the core collections of the Web of Science. Core collections in this context are the web of Science products already indexed in the high class, namely SSCI, SCIE, and AHCI.

On the other hand, ESCI belongs to the core collection but does not have an Impact Factor, and at least there is a positive point if a journal has been indexed on the ESCI Web of Science:

The ESCI Web of Science is another highway for journal internationalization. Journal managers still don't dare to register their journals with Scopus/maybe they have registered but are subject to an embargo. The internationalization of journals means that there will be a lot of interest from Foreign authors such as Turkey, Russia, Pakistan, Iran, Thailand, Malaysia who are interested and highly regard any product from WoS, even if it is just ESCI WoS.

SOURCE: Why is the ESCI Web of Science indexing level not equivalent or on the same level as Scopus indexed journals? | ResearchGate