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I would ask that be changed Imo.

any particular reason for that except running as clean an engine as possible?  dealers are not known for holding back on whatever they can charge you for, and in this case it seems as per factory guidelines oil filter does not need changing at 7500km.  I've always followed factory intervals for everything service-related, but maybe i'm missing something in this instance?

this is the compound i've been using for ages now, has served me well so far https://www.meguiars.com/automotive/products/meguiarsr-ultimate-compound-g17216-152-oz-liquid.  Applied this using CG hand pad.  Yes, wax i used was appropriate for ceramic cured paints.  I haven't yet used any water spot removal products but I can get my hands on the FSE product you mention, do you reckon that will solve the problem?

I've swapped over to my summer wheels. The tyres that are on the winter wheels still have loads of tread, but they are absolutely TERRIBLE for aquaplaning.
They are BF Goodrich GForce Winter on the front and Grip All Season on the rear. They are dated 2019, and wondered if they were just too old?

My only fear is that by not doing the service on schedule, if the car later has to go in for warranty work they will bring this up as a way to get out of it

I'd wait personally as you'd literally be throwing money away if you do it early and with the miles you've covered it definitely isn't a necessity. In regard to resale I can't imagine anyone being bothered if they check the service history thoroughly and can see the mileage between each service which you can argue is far more important than the time between services.

Although what SRGTD has said is correct, it's also not really a thing anymore due to paintwork being baked to harden, rather than to just dry and so it's unlikely to be the root cause unless repaired by a bodyshop without baking equipment.

There's plenty of folk getting PPF put on their cars immediately after a repair being carried out, further depending on the ceramic coating, the majority are gas permeable so can continue to let gasses out, although still advisable to let it sit for a week or so before working on the paintwork.

You mention rewaxxing the area, so I'm going to assume that you used a ceramic infused wax instead of a ceramic coating.

They're likely just hard bits of waterspots (limescale), and hand polishing may not have been aggressive enough (Some of them are hard enough to remove even with a machine polisher!), let me know what products / pad you used to hand polish to help further.

Koch Chemie FSE is a quick detailer with waterspot remover in it as well, it can help and leave a lovely finish. But if you provide us more information we can help better before saying to throw money at the issue.

Koch Chemie FSE
https://www.mycarcleaning.co.uk/products/koch-chemie-finish-spray-exterior-fse?variant=38097831166145&country=GB&currency=GBP&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gad_source=1&gad_campaignid=20041076128&gbraid=0AAAAAC7OoaGrOMQcPGyQ2QHrMdU9pTXXC&gclid=Cj0KCQjws83OBhD4ARIsACblj197tW_8UNN63dRmF7k2Gjr-nzTg2GqILcHUseqeqvWEeCvj3SAEdKUaAie3EALw_wcB