Original poster here. So, I read a number of message threads on this forum about breadboards, 3M and otherwise, and looked at several YouTube videos. And I ran more tests plugging various components into the 3M board.
While the 3M board does require more force to insert a lead, once I got the hang of it I concluded it wasn't all that bad. Ironically, the force in some cases is about the same as required where a wire is inserted into what is described as a poor-quality board at about 1:36 in this video:
On the other hand, I examined the sockets closely with a magnifier and concluded that the "funneling" of the electrical contacts (see ~3:10 in the above video) was in good shape, and not malformed in any way. So my conclusion is that 3M boards are just designed to be a tighter fit. The upside, as others have mentioned, is that the electrical connections can be expected to be more reliable.
After I got more experience working with the board, I'm finding I can insert most wires and components fairly easily. A 14-pin IC I just tried went in quite easily. On the other hand, a header with a whole lot of pins (such as you might use, say, for an Arduino) seems like it might pose a challenge. Also, as Richard Crowley notes, some leads on current-day components are pretty flimsy, and in some cases a pair of needle-nosed pliers made this go much more easily.
So, I talked to the retailer and I'm going to keep the original 3M board I ordered. Thanks for the suggestions here.