Hello,
Yes I would highly recommend it. I too have an RTX 3070 and now it’s fully utilised which is good. The simulator is still not making full use of the hardware which we all know about however at present I’m more than happy with performance. The IPC improvements alone for the Ryzen 5000 chips are probably what’s benefiting MSFS so much, the graphics are nice and it pushes my 3070 to its knees however there’s all the complex physics calcs that are being done which is now more manageable with the better cpu. I’d say go for the 5600x as difference between that and the 5900x is very small considering the massive diff in price!