I am not a pro but just amateur poking around. Initially, I thought all I needed was just an adjustable voltage source. I use a cheapo CC/CV "adjustable battery charger" boost-buck board as my main power source. Now I have come to rely on the CC/CV for exactly the protection already mentioned in early comments.
A cleaner power source would be good too - cleaner for me means less ripple. More power would be nice (20W is plenty for me. My cheapo can't deliver that). Stability is a given (who wants a board that wonders from 5 to 7V if you set it at 5); and a nice display of CC/CV setting and current output Current and Volt wont hurt.
Even with my limited requirement, CC/CV is #1 on the "must have" list even just for poking around. Next is good line and load regulation. My cheapo board has very good line-regulation and temperature drift (<2% combined), but very poor load regulation. I've come to realize I really want something better. (By the definition of amateur, it cannot be a need as none of my project is a must have). Next is lower ripple. Mine can at times get kick into an oscillation with up to 50mV ripple (well, it is just a $10 "charger" board), it is way too high. So more stability would be nice. 25Volt tops for me is enough. Oh, and a big large display on current (as NOW) Voltage, Current, and selected limits (on both CC and CV). That would avoid more mistakes for me.
So even just as a mere amateur, Lab grade needs? Probably not. But certainly some lab-grade level features would be nice for me (as listed above.)