Perhaps it might be wise to not lump all "dispensationalists" as "DARBY dispensationalists." Imo, that is the lack of distinction that some are making.
There is no doubt that many scholars taught forms of dispensation pre-Darby. However, the gentile "parenthesis" that was put into "Darby" dispensationalism is (imo) the area of distinction.
Some others may certainly (pre-Darby influence) have taught of the apostasy, the tribulation, the second coming, and even a rapture (though not called that) of the saint.
When a poster presents that all dispensational thinking is Darby and must conform to Darby, that is just inaccurate. If such is presented irregardless of the significant effort to show that the alignment is inappropriate, then the statements of inaccuracy becomes a point of not presenting the truth.
Darby was not the inventor of dispensational view. What Darby is may be a "type" or one "scheme" associated with dispensational view(s). He was also skillful in presenting and addressing the educational side of the view so that even a common pew sitter could grasp the overview.
The balance may be found in what Dallas Theological Seminary states in their doctrinal statement:
We believe that the dispensations are
not ways of salvation nor different methods of administering the so-called Covenant of Grace. They are not in themselves dependent on covenant relationships but are ways of life and responsibility to God which test the submission of man to His revealed will during a particular time.
Further reading on the statement of faith in full can be found
HERE.
The other is that presented by Ryrie. It must also be noted that Ryrie does a great service to lay out both definition and use which can be found
HERE.
In that writing Ryrie states:
"
Theoretically, the sine qua non ought to lie in the recognition of the fact that God has distinguishably different economies in governing the affairs of the world. Covenant theologians hold that there are various dispensations (and even use the word) within the outworking of the covenant of grace. ...
What, then, is the sine qua non of dispensationalism?
The answer is threefold.
1 A dispensationalist keeps Israel and the church distinct
2 This distinction between Israel and the church is born out of a system of hermeneutics that is usually called literal interpretation.
3 A third aspect of the sine qua non of dispensationalism is a rather technical matter that will be discussed more fully later (see chapter 5). It concerns the underlying purpose of God in the world .
...
The essence of dispensationalism, then, is the distinction between Israel and the church. This grows out of the dispensationalist's consistent employment of normal or plain or historical-grammatical interpretation, and it reflects an understanding of the basic purpose of God in all His dealings with mankind as that of glorifying Himself through salvation and other purposes as well."
Charles Ryrie did (does) (imo) give a very decent account of modern (not old Scofield definition but new Scofield definition) Dispensationalism by those who embrace the whole scheme.
However, Ryrie does not speak for all that hold some elements of that scheme anymore than I speak for all that post on the BB.