I have a 2009 Citroen and the battery is secured with a bolt that is under the battery compartment and to access it you need to go under the car with a very long wrench, who engineered it is a psycho
Since Dante wrote _The Inferno_, there has been a circle in Hell added where car designers are endlessly changing the spark plugs on AMC Javelins, bleeding brakes on Ford Escorts, and similar maintenance tasks which the design made more difficult than is reasonable.
I had a 2004 Citroen, which needed the front sidelight bulb replacing, after investigating for 20 minutes, decided to ask the garage how much it would cost next time it was in.
I left my Citroen to my mom, and my stepfather has calculated that a light bulb costs 3€, having the light bulb mounted by the mechanic costs 5€ ( including the bulb ), so to save up 2€ he decided ( with good cause ) that he will never replace the bulb himself cause it's extremely infuriating.
I did manage to replace those bulbs myself, and it's ridiculous, it has some sort of spring to hold it in place that is extremely hard to open with your fingers, and even harder to close. And on top of that you can't even see it, you have to take first pictures with your phone, understand how it works and then go entirely by tactic feedback
In this case, I couldn't see how to get at the bulb without either losing lots of skin or dismantling half the front end of the car - so I was happy to pay the half hour rate they charged. I believe they went in from below the car with something to reach it and mirrors.
Define "modern". I have a 2017 Civic and I've had to replace the battery a couple of times. There's a holding bar that needs to be removed before the battery can be taken out, but other than that the only real problem is the weight of the thing.
In general it looks like these kinds of changes are trying to make it harder for people to do this kind of basic maintenance themselves. Force you to go to the dealer.
I recommend to never go to the dealer, unless you're going there for a warranty or recall repair. A local repair shop is always the better option. And if you don't know of a trustworthy local shop, take it to the dealer for an estimate, and then you know if the local shops are bullshitting you (they should come in way under dealer prices).
While increasing dealer revenue is a plausible goal, it also seems plausible that reducing production cost could cause awkward maintenance. It is even plausible that only the bill of materials would be considered, though the feedback loop for increasing assembly cost is much tighter and less noisy that the loop of end-user dissatisfaction with maintenance issues.
Even within an organization, creating externalities from one department's perspective seems common enough.
Even if a decision maker is aware of the possibility of externalities and cares about a broader constituency (temporal or "spatial"), evaluating actual costs is an expense as is justifying that investigation expense and any mitigation/avoidance expenses to others in the decision web.
