I've heard the same thing, but never any actual evidence. As long as you use your BC for buoyancy and drysuit for warmth you will never have the problem of too much air in your suit. If you actually do have too much in your suit you will notice it before it becomes a problem. Most drysuit divers leave their dump valves open so that any excess air escapes.
You might also look on Ebay for cheap drysuits. I've had a couple of good experiences with them. One suit I bought for around $300 included thick undergarments. I made about 100 dives in that suit before giving it to Jeff Shaw. He's used it for the past couple of years. It's a bilam suit, so it tears easily, but can be repaired with tape or bicycle patches. I'm still using the undergarments after three years.
Oh, and there is a saying in the dive retail biz. A semi-dry wetsuit is like being semi-pregnant.
You might also look on Ebay for cheap drysuits. I've had a couple of good experiences with them. One suit I bought for around $300 included thick undergarments. I made about 100 dives in that suit before giving it to Jeff Shaw. He's used it for the past couple of years. It's a bilam suit, so it tears easily, but can be repaired with tape or bicycle patches. I'm still using the undergarments after three years.
Oh, and there is a saying in the dive retail biz. A semi-dry wetsuit is like being semi-pregnant.