The Scottish League is Not Just Celtic and Rangers

I read someone say that the Scottish League should just be Celtic playing Rangers to decide who the champions are. But that makes no sense as an argument. It would not be the Scottish League then. It would just be the Old Firm League.
I want Glasgow Celtic and Glasgow Rangers to stay in the Scottish League, so the league can genuinely decide who the best Scottish teams are, as with the other teams in the Premier,
But a true Scottish League needs more than just two teams. It needs teams in the League to fundamentally prove that Celtic and Rangers are capable of beating other teams in the top league.
Plus the race for European qualification is important. The relegation battles are important. The races to get promoted into the top leagues are important.
We need other teams to develop players for international sides particularly Scotland.

The vast majority of teams in the English League have not won the League Title in their history. Should they all be chucked out of the English League? And the league only played between teams who have already won the league at least once in their history.

The Scottish league has been won 4 times each by Aberdeen, Hearts and Hibernian.
Should they be chucked out of the top league even when they have not been relegated?
The two big Dundee teams have won the league, as well as Kilmarnock, Dumbarton, Motherwell, and the old Third Lanark side.
Plus so far this season Celtic and Rangers won once and lost once against each other in the league,. Yet Celtic are way ahead ion the league. So their performances against other Scottish League sides has been relevant in determining which side should win the league.
It is possible that Celtic could beat Rangers twice, draw once and lose once, and still in the same hypothetical season finish behind Rangers.

There are tonnes of pro and semi pro sides in Scotland. They deserve a chance to play Celtic or Rangers in the league. So Celtic and Rangers and the opposing trams can prove who has the best side.