With some coins going up 50% or even l00% in a day or few days or in a week... any reason why bitcoin doesn't do that almost ever?
Yea sure.

Why would you even compare that? Are you trying to forget Bitcoin is raising till this date since 4 months ago?
Almost 400% in last 4 months and you didn't even realize that if you think on long term. Many altcoins can't do the same stuff as Bitcoin.
I know it's not by a day but it's still ridiculous to see people have such thought.
Look at binance coin and many of those other coins that are literally doubling in a week. Now the btc dominance is going so low.
Probably your opinion just biased at this point. Bitcoin however is still going strong and whenever you want to trade there will be enough liquidity to ensure you trade it efficiently.