Totally untrue, any power supply not completely hard wired , can be substantially upgraded,companies build these to a price point , just as a very good power cord
will increase fidelity ,a good LPS I have tried several brands with excellent results
Paul Hines I am told msy have closed the doors ,8 own a mojo audio which is very good ,but Benntook 2 years off making them ,Uptone is very good ,fared is also excellent but very troubling only 1 year warranty ,and you pay shipping both ways if any issues no thanks , Teddy Pardo the Best Buy sonically, and warranty 3 years for around $500. I highly recommend getting synergistic purple fuse
and their $50 DC cable upgrade.