Even if you decide not to fight this one, please consider informing one of the major consumer rights organisations so if there is a design flaw and others are experiencing the same problem the manufacturer can't bury their head in the sand and try to avoid responsibility. Other big tech firms have allegedly done this in the past and bad publicity is often what brings them round in the end.
I had a case on the phone which I removed just an hour earlier because it was dirty underneath, and wit lockdown and working from home I wasn't leaving the house, I saw no need to put it back on, felt like Karma.
Yes I believe the design contributed significantly to it breaking, it just wasn't the time for me to add more stress trying to fight it.
I'm a strange way, it was a good thing, I'm a perfectionist, and having a broken screen put me off wanting to use my phone, that's a good thing in a weird way.
Oneplus will repair it for £200 for the part PLUS tax PLUS shipping PLUS labour and I'll have to ship it out of the country somewhere and wait a number of weeks they won't disclose to have my phone back. Heck, they won't even tell me how much the labour cost _might_ be.
If they'd sell the parts and allow one of the many phone repair shops in the UK to fix it, I could have it within an hour or two for little more than the cost of the screen itself.
This isn't about making your devices shitty, fat and not-waterproof, it's about enabling people with the wills and the skills to buy the tools and the parts to do the job.
Heck, under a good right-to-repair, I could buy the screen myself and fit it if I wanted.
So many people miss the point of right-to-repair. It's not about making things less this or less that, it's simply about giving you the RIGHT to buy the parts you need and the tools you need to repair the thing you own.