In the past people in online forums could argue for hours and days based on nothing but personal opinions and very subjective observation of phenotypes, but with recent advances in dna tests and analysis over the last couple of years, we can now measure genetic distance between different groups of people and put an end to this debate.
There's an online tool called Vahaduo which is used very commonly by both the academic and amateur genetics enthusiasts. Publicly available dna result data can be entered into this tool to calculate genetic distance between two different ethnicities.
I have used the data available
here to find the distances posted below.
Here's just one example why Indians cannot be seen as one people and no amount of argument can change hard scientific data and results.
Here is the distance between an Englishman and a Dutch, below. This means nothing by itself, but compare this number with the comparison further below, between an UP Brahmin and an average person from UP.
View attachment 727977
Distance between UP Brahmin and average UP person:
View attachment 727980
So basically an average guy in UP (India) is 6 times further away from a Brahmin living just next to him, compared to genetic distance between Englishman and Dutch.
So it's really absurd when Indians talk about Akhand Bharat including Pakistan, Tibet and Malaysia, when India itself is really not a single race but a continent containing extremely genetically diverse people!