One way compression seems to work is by increasing the resting tone of the muscles through action on the sensory fibers within the muscle. (spindle fibers, etc.)

When the resting tone is higher, your muscles are working a bit harder. Using compression in this case is NOT going to make the muscles weak.

Kinesiotape works more through drag than through compression, but it also facilitates the muscle activity, and again is not going to make the muscles weak.

(though you may *feel* weaker when you take the tights or tape off because the facilitation drops back down to normal again and the comparison is a bummer)