The handbook of the only BMW I’ve had, a 1990 ish E30 3 series, said to add weight in the rear footwells to increase grip in snow. They probably don’t do that now, it would seem to undermine all the technology!
I run my Mk 1 Eunos on winter tyres as soon as the temp gets to around 10c and they are great in very heavy rain. and make all the inputs softer as they squirm about.
We had enough snow in the westcountry to make them usefull a couple of years ago. The gripped really well in 2"s of snow I could still accelerate quite hard and brake well, I had a go at grip levels on the industrial estate before driving home, I had enough control to be able to overtake slow moving cars that were barely moving fast enough to get up inclines. ( The car is useless on toyo proxies in the snow, it would not move on 1/2" snow ) I grew up with rear wheel drive so its normal for me, I have driven quite happily at 50 Mph on snow in a Mk1 Escort, Mgb Roadster and now the Eunos has joined the 50 mph on snow club. I have only driven my Austin Seven at 45 Mph on snow ! Its all down to the correct tyres for the job. As far as TCS goes Its over rated I have driven uphill on grass past a landrover that had its traction control switched on it would spin a wheel then another then the turbo kicked in and span all four wheels the TCS then applied all four brakes and stalled the engine this was funny to watch as I drove past in an 85 year old rear wheel drive car.
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It sounds to me like a clutch issue and it is slipping. The traction control reduces power so the revs would go down!
Give me a rear wheel drive car with 50/50 weight ratio and winter tyres to drive in the snow and I will have fun all day.
Remember where you get up you need to get back down again and I am not hearing Paul_mk saying that his ABS is kicking in on his decent in the multi-storey.
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If the engine revs go up and it’s just like declutching then it’s nothing to do with the TCS and everything to do with the tyres simply losing traction. Is the car a 1.5? It’s my understanding that a limited slip diff only comes as standard on 2.0 cars. My 2.0 NC (on full Winter tyres) never has such problems - the only time it ever got stuck was due to deep snow under the chassis keeping the weight off the rear wheels. It basically romps up any gradient in icy conditions, even when (presumably) Summer-tyre equipped FWD cars have slithered to a scrabbling halt.
OTOH, a few years ago I had a BMW 328i automatic. On its Summer tyres it would happily spin one of the rear wheels if I simply engaged Drive on a slight gradient (no throttle input at all) in icy conditions.