Yea, it's true that reading and analyzing the price chart does not hurt, but your analysis should have no part to play in your decision in investing in Bitcoin because reading and analyzing the price chart are for traders not investors, our duty as a Bitcoin investor is to buy it once our discretionary income is available regardless of it price as at then
Why not, seriously may I ask you?
Nothing to be sure 100% even with Bitcoin, so even you are a long term Bitcoin investor and plan to have very diamond hands for holding your bitcoins, I believe that checking Bitcoin price chart is never bad. You are not a trader so you don't need to check Bitcoin price chart too regularly like daily, hourly, minute but let's say you must check it to know what is going on with the market and if a blackswan even happens with Bitcoin, you can exit your position.
It can be helpful if you manage your finance with a part for investment capital which is splitted into two smaller parts. One part is for your regular DCA and with this part you never mind about price. A second part is for dip buying and this requires you to check Bitcoin price for knowing when a dip happens.