I'll give my two cents, hopefully it'll help you make a purchase decision.
I have recently (June 2020) purchased a 2019 (March) Turbo for 4.1m, driven under 15k, well maintained with service history and faced similar comments regarding the price being steep which is agreeable however I decided to jump the gun and got it. My experience so far has been great. No issues whatsoever (Alhamdulillah) so I can wholeheartedly advise you to go for it. Try to get the price down to 4m if possible though.
Maintenance is comparable to 1.8 & shouldn't be a deciding factor. There is a marginal difference in the cost of 0w20 and 5w30 grade which one needs to change every 4-5k kms.
A couple of members have reported a significant improvement in drive after getting the sparkplugs changed at 20-30k kms (which depends on the quality of fuel used previously) However, as the fuel quality has improved due to euro5 standard I think the intervals would be wider henceforth.
Steering rack issue purely depends on luck, there are cases where out of warranty cars got them changed after getting accepted as a quality defect as one of the member mentioned.
Best of luck!