I wouldn’t say these are common failure points, that I know/heard of. It could be the results from a road incident you were not aware of. If a shop notices something needs repair they will suggest you to replace it. I will say even the best shop can misdiagnose (quick to judge) sometimes.
-Did you hear clicking/ticketing or any unusual sound (cyclical) when rolling or turning left or right?
-Did the power steering fluid level constantly run low and needing top off?
Depending on the state of damage, these parts can be R&R but shops usually won’t do R&R – much easier and quicker to just slap on a new part since it is your expense. They do sell replacement CV boots and grease to repack an axle, and sell rack and pinion seal kits + bellows to R&R. Labor you cannot do anything about esp. it sounds like you know/trust the shop so the only savings would be parts, which you could have shopped around/supplied yourself to save a little. I will say $105 for 2 wheel toe alignment is on the upper end of premium. Must be a nice shop.
Do you have an invoice with product name/number they used? I’m curious what axle they put in; OEM axle cost an arm and a leg.