It is. The style I use is also not well liked by some pros, but I hope readers can appreciate it. I have a rare vision problem that often requires me to wear a pair of contacts and a pair of glasses simultaneously and one of my mentors in comics is visually impaired, so legibility is of extreme importance to me. If I can't even guess what something says with only my contacts or only my reading glasses on, I increase the size by a point or two, or I use a different font. I also love sound effects, and digital lettering (besides making consistent legibility easier) makes it possible to have all kinds of fun. But again, not at the expense of legibility. The only time I've broken that rule was in a panel set on a train car full of extremely noisy (and rude) people. Then I focused on conveying the level of noise they were making by overlapping a whole bunch of jabber, leaving some conversation clear enough the reader can understand the nature of what all the noise is about.
