There are two completely separate issues here, and they need to be disentangled to have a productive discussion.
First, there is the question of the right-to-repair and to what extent Apple is hostile to the existence of a viable second-party and third-party repair ecosystem, neutral to it, or actively supports it.
Second, there is the question of the relationship between the costs of the product and the costs of the things needed to repair the product, like replacement screens.
The two are not entirely orthogonal, because many strategies for reducing the costs of the product or increasing the utility of a working product have consequences with respect to the costs of components and the ease of third-party repair.
An example discussed on HN many times is the choice between user-removable batteries and building a battery in. When it's built-in, engineers have more options for miniaturization or increasing battery size and product life. The consequence, of course, is that batteries are now expensive to replace, and the batteries themselves are harder to get in a third-party ecosystem because there is little standardization: Every device might have a different battery optimized for that device.
If batteries were standard sizes as they are for many consumer devices with removable batteries, engineers have less flexibility to increase battery life, reduce weight, or reduce device size.
The same reasoning extends to replacing screens and keyboards. Supporting a vibrant and viable third-party ecosystem means making engineering compromises that have a distinct effect on the product's price and competitiveness in a world where every review discusses device weight, size, battery life, &tc.
The very best thing for a third-party repair ecosystem is to have fewer device-specific parts, fewer proprietary connectors, fewer components hard-wired into place, fewer components that change from device version to device version, &c.
The more different parts there are, the more that are introduced for a model or two and then discontinued, the harder it is for the viability of a third-party ecosystem with affordable options.
I feel that there's a deep and challenging tension between repairability and the immediate, out-of-the-box product value. In some industries, consumers value the ability to wrench their own product higher than in others. In bicycles, for example, there is a great deal of conservatism around engineering.
For all the bragging about new technology, the bicycle industry doesn't really advance very quickly. What do we have now, twelve-speed rear clusters? Whereas when I raced in the 80s, there were seven speeds back there. Whup-dee-doo, where are the internal gearboxes? And the other big innovations are disc brakes and electronic shifting? Compared to the advances in telephones, this is nearly nothing. When I had a mechanical seven-speed rear mech, I also had a physical phone hard-wired into my car. That was "mobile communications" back then.
I'm not defending Apple, it's up to everyone to decide for themselves which choices they think Apple should make. But we should accept that any choice for making things repairable has an impact on the out-of-the-box value of the device itself.
And if we want right-to-repair to be a viable and profitable business choice, something has to change about the marketplace itself, namely:
1. Get consumers to repair their devices far more often than they replace them, and;
2. Regulation.
I prefer regulation, personally. Yes, it's the bogeyman of "regulated marketplaces." But it also creates a level playing field, so that repairable devices do not have to suffer product reviews complaining about their price, weight, size, lack of differentiation from other devices sharing common standards, &c.