Frank
Yes, I also am in support to take the best for gameplay from all worlds. In this case I rather like the current fixed boost as it's a challenge to juggle early use and final sprint to make the best out of it. A rechargeable one means adding a tedious action to use some every lap at the best spot to never reach 100% and waste any recharge and makes it more useless for overtaking as there's much less incentive not to use boost to defend the position.
Agree, it would become a boring procedure every lap. Now, you need to read the race as best as you can and judge when to jump forward, with rechargeable boost, it would take away the importance of this skill or intuition whatever you call it