Have you considered the possibility that rather than being subservient to the president, the GOP in the Senate became the dominant policy making body in the government instead of the White House, achieving the long-term conservative goal of more parliamentary style of governance?

Senators like @SenSasse openly defy and denigrate the president, yet they are not censured or primaried by the party. It's only when someone threatens the Republican hold of the presidency that he is censured, since this is a neccesary part of the (positive) scheme

Not that Trump is subservient to the Senate- at least not in his own eyes. It's simply easier for parliamentarians to assume a more dynamic role when he is the chief executive.

Consider that Trump and McConnell have a very different type of personality and energy- one tend to explode with big projects and grand designs (you may question the effectiveness and utility of some of them, but that's what they are) while the other is a silent workhorse

A warrior vs. a soldier if you will.

McConnell doesn't give a hoot if he grinds Schummer to dust or have to spar with him for another half a century as long as he achieves his most important goals.
For Trump, crushing his rivals is everything

Now who is more effective? Who is more important ti have?
If you believe your rivals are wicked and arrogant and need to be brought down a notch, you need a Trump. If you think they present long term threat thag needs to be subverted and outsmarted, you are looking for a Mitch.

The interesting thing about the current alliance between the two is that they either agreed that both are true, or that the party is divided between the two views, and therefore they need to govern together

Of course they don't think much about each other. To a "soldier" like the common GOP senator, Trump looks brash, boastful and unfocused. To a "warrior" like Trump, theh look too calculating and cold.

But they need each other. They find out that after a very long time, they had four years of actually legislating in reality, not just writing bills for an adversarial president to tear up or a Supreme Court to rule out.

Both sides understand the nature of that deal. They accept it.

Because at the end of the day it gives each side more freedom to do what it actually wants to do.