Weezy Rider

No to drop in bobbins. I've used both types and front and side loaders are easier to deal with when your machine really gets hung up or snarled.

Embroidery on the older Pfaffs - lift up the hoop slightly and cut the threads under the hoop with a surgical seam ripper.
Move the hoop, and you can clean out the jam without losing your place. (the hoops moved to the back, you could sew with the embroidery arm on)

There has to be a reason why the big quilters and the smaller single stitch are not drop in.

To mfg.
Don't just make things that seem like good ideas to cheapen costs and are "logical" to you.
I've seen discussions on walking feet for the single stitch machines that don't have a place to put the quilting guide. The Brother PQ1500S is one, the Juki 2010 is another. Janome does seem to have a foot out for its machine.
Just because FMQ is all the rage, there are still plenty of others who prefer geometric quilting with a walking foot and don't like taping or marking all the quilt. It shouldn't be that hard to add a clip or a hole for the quilting bar.

If you don't have the harp room, also make feet available that will sew from the left as well as the right on a single stitch machine. That way you could keep the bulk of a quilt to the left.

Good feet do a lot. Pfaff, Viking and Bernina seem to have a foot for everything. I got challenged to do some heirloom on a TOL Babylock years ago, and I had to fudge since quite a few feet weren't available then. (They are now)

I'm for any good tool that makes my life easier.

Some items are exactly as advertised. I bought a SewEzi table and was impressed at the workmanship on mine. The bolts were flush, the top was extremely smooth, and the cutouts were exact. The one advantage the SewEzi has, is the open right end. I've almost buggered the foot pedal connectors using cabinets. I forget to pull the cord. I can just pick up the machine from the SewEzi - the end doesn't have anything to catch the pedal cord.